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View Poll Results: What size and type exhaust?
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2" single (stock)
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4 |
7.55% |
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2.5" single
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25 |
47.17% |
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3" single
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24 |
45.28% |
06-08-2011, 07:53 PM
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Bleedin' Gasoline
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Join Date: Jan 09, 2011
Location: Flagstaff, AZ
Posts: 2,240
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What size exhaust?
The stock 2" single is too restrictive. Tailpipe size is an issue because I don't want to be bottoming out on a large pipe offroad.
__________________
1972 Custom Wagoneer:
AMC 360 MC2150, THM400, Dana 20, 3.31 gears.
1965 Rambler Ambassador 990:
AMC 327, Borg-Warner Auto.
1973 AMC Ambassador:
AMC 360 MC4300, TC-727.
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06-08-2011, 08:02 PM
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FSJ Maniac
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Join Date: Aug 08, 2010
Location: Maryland/ Williamsport, PA
Posts: 2,932
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I think I would go 3" all the way out, or 2.5" if your going true duel.
__________________
Austin
1991 Hunter Green Grand Wagoneer
5.9 2bbl-727-NP229-TFI-30x9.5 Firestone M/T's-Brush Guard-tire mount
SOON: 4350 and cast iron intake
Others:
-1994 Baby Grand
-2000 XJ cherokee on Tons
-1953 REO M35A2 6x6
-1955 Willys Pickup
Quote:
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Originally Posted by rustywagoneers_com
i am not an addict, i can stop anytime.
i dont have a problem, you people have the problem.
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06-08-2011, 08:20 PM
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FSJ Maniac
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Join Date: Jul 12, 2001
Location: Cedar Rapids, IA
Posts: 3,414
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Quote:
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Originally Posted by austinaubinoe
I think I would go 3" all the way out, or 2.5" if your going true duel.
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Why fight? Go 2.5" dual exhaust.  |
06-08-2011, 08:52 PM
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Gear Head
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Join Date: Jan 19, 2011
Location: Loveland, CO
Posts: 711
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Dual 2 inch. Greater cross sectional area than a single 2.5, but less than a single 3 inch. 2 inch is easier to route. Dual 2.5 is just too much unless you have a hopped up 401.
__________________
If at first you don't succeed, use a bigger hammer.
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06-08-2011, 09:18 PM
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Member
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Join Date: Jan 29, 2011
Location: Chicago Il
Posts: 119
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If you have to keep it single and you're stone stock 3" is the max. You won't feel much of a difference between single 2.5 and 3.
I'm a big fan of going with dual 2.5 and anticipating future mods too. 
__________________
1979 Cherokee Chief
3" RC suspension lift
3" Body lift (going away ASAP)
35x12.50 BFG MT (dry as heck!)
4.30 gears, lunchbox locker with hardened pin
All emissions equipment intact!
Passed the 4000 mile mark and 1 "major" issue.
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06-08-2011, 09:27 PM
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FSJ Maniac
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Join Date: Feb 21, 2010
Location: Chicagoland
Posts: 2,851
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Unless you are going to run headers you may not notice a difference at all and likely wouldn't be worth it.
If I were going to do it I'd run headers with 2.25 or 2.5 duals.
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06-08-2011, 09:28 PM
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Master Mechanic
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Join Date: Mar 16, 2008
Location: Corvallis, OR
Posts: 1,142
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2.5 duals are fine on a 360, I'm running them and it's fine, I would either go 2.25" or 2.5" duals, or a single 3". The single is gonna be easier to route than duals.
__________________
Pierce,
77 J10 360 4bbl, T18, D20, HEI, Holley carb, Performer intake, Thumpr Cam, Hedman headers, dual exhaust, Auburn limited slip, hydroboost.
http://www.youtube.com/watch?v=z-vRy...&feature=g-upl
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06-08-2011, 09:38 PM
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Member
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Join Date: Oct 16, 2007
Location: Minturn Co
Posts: 64
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headers and 2.5 true duals.. it sounds real mean.
__________________
Patryk M.
1990 GW
360. edlebrock intake,cam,timing set, 650 cfm Thunder AVS carb, heddman headers. HEI
Bjs 6in Lift, 1in shackles, 2in body lift, B&m FloorShifter, 33"xterrains,33gal bronco Tank,Flowmaster 40 Dual pipes,
bjs aluminum rad. Electric Fan, sweet new paint job
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06-09-2011, 08:10 AM
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Gear Head
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Join Date: Sep 19, 2007
Location: El Paso, Texas
Posts: 666
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Kind of a dumb question, when you say true duals does that include a crossover pipe?
__________________
George
'74 Cherokee, 401
'76 J-20, 401
M725, future project
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06-09-2011, 09:31 AM
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FSJ Maniac
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Join Date: May 19, 2002
Location: Pumpkintown, South Carolina
Posts: 3,775
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Quote:
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Originally Posted by Ugly Truck Nut
Kind of a dumb question, when you say true duals does that include a crossover pipe?
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It should, or you'll be giving up some torque across the rev range, and probably end up with about the same or less power than with the stock setup. With a 90-degree V8 with a 18436572 firing order, the only other way to acheive even exhaust pulses is with 180-degree headers that route two primaries from each bank into each collector, and there's just no room for that. Dual exhaust on a rig with Jeep-ish operating parameters and available space are merely cosmetic.
S.J.
__________________
"Carpe Mañana".
'83 Wagoneer
360, .030-over, K8600 cam, Crane springs, ported heads, Edelbrock Performer, G.M. TBI, TFI, 3" exhaust,
T-18a/208, D44/AMC 20 w/ limited slip in both, 3.73s, 33s, BDS 4" springs, Rancho 9000 shocks, etc., etc.
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06-09-2011, 11:49 AM
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Gear Head
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Join Date: Jan 19, 2011
Location: Loveland, CO
Posts: 711
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Then their are those of us who have to live with emissions standards. I have to have a single exhaust, but I can have dual ends. And I only have to buy one muffler and one cat.
__________________
If at first you don't succeed, use a bigger hammer.
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06-09-2011, 01:20 PM
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FSJ Maniac
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Join Date: Jan 17, 2002
Location: Gilbert, AZ
Posts: 2,853
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I run a dual 2.25" in/single 3" out muffler with headers. Sounds good. Runs good.
__________________
'71 J2000 Gladiator
'95 YJ on Waggy axles
'80 911 Super Carrera
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06-09-2011, 02:51 PM
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FSJ Maniac
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Join Date: May 17, 2007
Location: Algonquin (Chicago suburb) Illinois
Posts: 3,669
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I would say 2.5 duals but 3" if your going single
__________________
91' Grand Wagoneer
401/727/229, HEI, Edel 2131 Intake,8600, Holley Truck Avenger, Dual Exhaust, Flowmaster 70. Edelbrock shorty headers.4" BJS 31 BFG Mud-Terrains
Currently: Down for Body Work
80's J10 258/T-5/208
90' Jeep GrandWagoneer SOLD
74' J10 Go Grabber Green Running
Quote:
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Originally Posted by Heavy_Metal_Thunder_81
Inferior Chevy
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06-10-2011, 05:36 AM
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Roadside Mechanic
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Join Date: Dec 29, 2003
Location: Western MA
Posts: 9,726
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If offroading involves the need for WOT at high rpms then I can see an oversize exhaust applied. Otherwise it's mere ear candy.
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06-10-2011, 05:10 PM
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FSJ Maniac
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Join Date: Nov 20, 2008
Location: Wilds of Ellington, CT
Posts: 3,814
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Quote:
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Originally Posted by drlocke
If offroading involves the need for WOT at high rpms then I can see an oversize exhaust applied. Otherwise it's mere ear candy.
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Really. You read my mind. Last I knew headers don't do a thing until 3500-4000 RPM...except make more noise.
__________________
Jeepasaurus (Wagonus Grandi quadropedus)
88 GW 360-.030 over/2150/727/229/Posi, e-pump, AC (broke), tow package, Monroe Air Shocks, dizzy manifold vacuum, CTO-Free, AIR-free, oil & tranny coolers, dried knuckle blood all over, GM 350 TBI in a box, waiting...
"You're an FSJ'r when the parts guys memorize your name, phone & credit card#."
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06-10-2011, 06:13 PM
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FSJ Maniac
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Join Date: May 19, 2002
Location: Pumpkintown, South Carolina
Posts: 3,775
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Quote:
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Originally Posted by drlocke
If offroading involves the need for WOT at high rpms then I can see an oversize exhaust applied. Otherwise it's mere ear candy.
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Well, then there are those of us who want it all. I have a gigantic muffler (some Mitsubishi junkyard thing) on my Wagoneer that's Lexus quiet, and the 3" system sort of makes up for the backpressure imposed by all that silence. I like not scaring the elk when I drive up because it helps me eat better, but don't much like giving up power if I don't have to.
A 3" single pipe, by the way, has about the same cross-section area as 2-1/4" duals, and it's easier to do a single pipe system on these rigs without making goofy compromises. The tailpipe on mine has gone a little bit oval on rocks, so clearance is probably now about the same as stock.
S.J.
__________________
"Carpe Mañana".
'83 Wagoneer
360, .030-over, K8600 cam, Crane springs, ported heads, Edelbrock Performer, G.M. TBI, TFI, 3" exhaust,
T-18a/208, D44/AMC 20 w/ limited slip in both, 3.73s, 33s, BDS 4" springs, Rancho 9000 shocks, etc., etc.
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06-10-2011, 08:32 PM
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FSJ Maniac
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Join Date: Nov 20, 2008
Location: Wilds of Ellington, CT
Posts: 3,814
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Quote:
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Originally Posted by Serious Johnson
I have a gigantic muffler (some Mitsubishi junkyard thing) on my Wagoneer that's Lexus quiet...
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Really?!...I wish you knew what model/year it came from. I'd want to know.
__________________
Jeepasaurus (Wagonus Grandi quadropedus)
88 GW 360-.030 over/2150/727/229/Posi, e-pump, AC (broke), tow package, Monroe Air Shocks, dizzy manifold vacuum, CTO-Free, AIR-free, oil & tranny coolers, dried knuckle blood all over, GM 350 TBI in a box, waiting...
"You're an FSJ'r when the parts guys memorize your name, phone & credit card#."
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06-10-2011, 09:16 PM
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FSJ Maniac
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Join Date: May 19, 2002
Location: Pumpkintown, South Carolina
Posts: 3,775
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Quote:
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Originally Posted by Rich88
Really?!...I wish you knew what model/year it came from. I'd want to know.
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I have no idea. I assume that it was from some sort of commercial diesel, since I can't think of any Mitsubishi road car or truck that would have a 3" muffler. It surely is quiet -- have to glance at the tach now and then to be sure the thing is running. And 20 bucks seemed pretty good for such a big hunk of stainless. It does hang down a bit -- almost as long and deeper than a stock Wagoneer gas tank.
S.J.
__________________
"Carpe Mañana".
'83 Wagoneer
360, .030-over, K8600 cam, Crane springs, ported heads, Edelbrock Performer, G.M. TBI, TFI, 3" exhaust,
T-18a/208, D44/AMC 20 w/ limited slip in both, 3.73s, 33s, BDS 4" springs, Rancho 9000 shocks, etc., etc.
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06-10-2011, 11:11 PM
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Master Mechanic
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Join Date: Sep 22, 2010
Location: Ephrata, WA
Posts: 771
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3" single or ANY size duals. 
I run true duals, they sound good. Engine runs good. I'll be switching from 2.5 sidepipes to 2" duals straight out the back.
__________________
1979 Jeep Cherokee Chief Sport 4 door N/T.
-AMC 360 with RV cam
-T-15A, Dana 20
-Dana 44's, 3.54's,
-32x11.50r16's
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06-11-2011, 12:46 AM
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Gear Head
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Join Date: Apr 15, 2008
Location: Lima,Oh
Posts: 584
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I currently am running side pipes i think there 2.5 into some flowmaster 40s. sounds really really nice.
i want to redo the exhaust so my pipes arnt rock targets anymore and ill prolly run 2.5 y pipe off headers into a single 3in all the way back under the bed. with a flowmaster 40 or 50. hoping to keep a simulator sound as i love way it sounds now just not all the leaks
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