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08-05-2002, 07:11 AM
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Join Date: Jul 07, 2002
Location: Seattle, WA
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Seriously thinking of switching over to duals on Ursula. Seems like it'd be pretty straight-forward, but am very interested in any opinions, stories, facts and figures out there.
Anybody get any more horsies out the 360 like that? What did you use? Worth it for any reason other than the lovely tone that I imagine??
Cheers all.
~CT
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'80 Cherokee Laredo WT AMC360|MC2150|BFG33s|BJ\'s 4in Lift|&SOMEOTHERTASTYSTUFF
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08-05-2002, 07:27 AM
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Gear Head
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Join Date: May 10, 2000
Location: Suffolk, VA USA
Posts: 693
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Are you talking about true duals or rear dual pipes?
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87 GW & it\'s brown
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08-05-2002, 07:29 AM
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Join Date: Jul 07, 2002
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No, I mean true... good-nite to Y-pipe dual.

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'80 Cherokee Laredo WT AMC360|MC2150|BFG33s|BJ\'s 4in Lift|&SOMEOTHERTASTYSTUFF
"Somewhere in the Neighborhood of Be"
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08-05-2002, 07:50 AM
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Join Date: Apr 28, 2000
Location: PNWet, USA
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Unless you run both duals down one side you'll have trouble getting around the fuel tank. It's been done but to do it cleanly will take some creative plumbing(read expensive). If it were me I'd just go with a single 3" exhaust system. Less hassel and a lot cleaner install.
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joe
"when we were children, we are reborn every morning,but when we are older, a little of us dies every night, killed by mortgages, bills, dry rot, rising damp. When we travel, though, we are children again."
-Geoff Hill
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08-05-2002, 07:57 AM
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Join Date: Jul 07, 2002
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Hmmmm. Yes, that's the what I was noticing when I was looking under there. You may be right on with the 3", though the tone of duals just always puts a bigger smile on my face. Maybe I'll just roll under there tonight and start imagining.
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'80 Cherokee Laredo WT AMC360|MC2150|BFG33s|BJ\'s 4in Lift|&SOMEOTHERTASTYSTUFF
"Somewhere in the Neighborhood of Be"
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08-05-2002, 07:59 AM
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Member
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Join Date: Apr 11, 2001
Location: Oakland CA
Posts: 133
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I had a true dual setup on my GW. My brother-in-law did it at his muffler shop. It took him 5 hours and $280 in materials. It looked great, run down the passenger side, had twin catalitic converters, twin turbo muffs and twin chrome tips coming out the right rear. Funny thing is that while it breathed well at higher revs, it lost some low end grunt and got worse MPG. On my Chief, I will be going with the 3" setup.
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1977 Cherokee Chief<br />360 4v<br />Q/T with part-time conversion<br />TH400<br />4.09 gears w/Auburn L/S(rear)
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08-05-2002, 08:09 AM
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Huh. Interesting... I wonder why..
Good info man, thanks.
The 3in may sound more inticing then.
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www.klondike-5.com
'80 Cherokee Laredo WT AMC360|MC2150|BFG33s|BJ\'s 4in Lift|&SOMEOTHERTASTYSTUFF
"Somewhere in the Neighborhood of Be"
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08-05-2002, 08:18 AM
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Super Moderator Ph.D. in FSJ
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Join Date: Apr 18, 2000
Location: Lakewood, Calif
Posts: 11,643
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A single 3" pipe sounds AWESOME!!! I have heard the Ramjet 350 up close and personal and let me tell ya.. 6500 rpms outta 3" pipe capped with a Delta series Flowmaster was enuf to make me sit down for a minute or two...
I have dual 2.25" bombs for now...headers and no cats... it's not too obnoxiuos but will be better with 2 chamber Flow's
Bombs are the worst flowing thing made...they look like they would bee good with a open tube, but the fins they put in them create alot of turbulence for the airflow. These are just to get me by for now...
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08-05-2002, 08:23 AM
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Bleedin' Gasoline
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Join Date: Nov 29, 2000
Location: covington,ga
Posts: 2,141
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Ive got a stock y pipe with a single cherrybomb,no cat, in 2.25 pipe, sounds pretty dang good to me, helps drown out the swampers! 
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08-05-2002, 09:24 AM
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Bleedin' Gasoline
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Join Date: May 25, 2002
Location: Superior, WI
Posts: 2,084
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As mentioned earlier, when you free up your exhaust, you lose your low end torque and reduce your city MPG. Highway MPG should increase as that is where the positive effect is. This applies to both dual exhaust set ups and larger single pipes. If you don't need or want the lower end torque (which comes in handy for off-raoding and towing) then go with the duals or the 3".
I've analized the dual exhaust potential in the past and couldn't help but notice how nicely a muffler or two would fit up inside where the spare tire storage is.
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08-05-2002, 12:09 PM
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Gear Head
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Join Date: May 10, 2000
Location: Suffolk, VA USA
Posts: 693
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Yeah, that is a great place for a camero style flowmaster. The camero flowmasters are made for the center and have pipes on both sides. Would work good, if you wanted duals for mostly looks.
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87 GW & it\'s brown
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08-05-2002, 04:24 PM
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Member
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Join Date: Mar 25, 2002
Location: Kingsport, Tennessee
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The Beast has 50 series Flowmaster with single 2.5" exhaust pipe and sounds very impressive while retaining the bottom end torque. This of course, is without any emissions crap, so I'm sure the tone is enhanced by the lack of "cadillac converter." (She sounds better everyday as far as I'm concerned!)
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\"The Beast\"<br />\'87 Grand Wagoneer:<br /> AMC 360<br /> 727 Torqueflight<br /> 50 series Flowmaster <br /> with 2.5\" aluminized,<br /> mandrel bent exhaust/tail pipe<br /> Warn manual hubs<br /> Lucas/MMO fluids
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08-05-2002, 11:42 PM
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Bleedin' Gasoline
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Join Date: Dec 05, 2000
Location: des moines iowa ,50311
Posts: 2,334
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I had 2 .5" all aluminized, fully welded duals with rear tire exit installed. No mufflers, just straight through. can't beat it for performance, just the rite amount of pressure
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1974 wagoneer Built BBB455/th400/QT/HD44/D60/9"lift/36"TSL's 10k winch DAILY DRIVER
1977 J20 Dually amc 360/4speed/D20 80k PLOW RIG
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08-06-2002, 03:24 AM
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Super Moderator Dr. Rockcrawler
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Join Date: Apr 03, 2001
Location: Where spuds grow
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I have a single 3in exhaust with a dynomax race series muffler. I had a dual exhaust that I took off. I have more off ideal torque than with the duals. I like the overall performance of the single.
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79 waggoneer
AMC360/TH-400/203/205
DANA 60/14 BOLT 5.13'S AND DETROITS
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08-06-2002, 06:09 AM
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Member
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Join Date: Jun 27, 2001
Location: Greenville, NC, USA
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How much backpressure does the cat really create? I believe the stock system on my 89 is a 2.5 inch. Would it be better to remove the cat and put a nice Flowmaster on with a 2.5 inch system or would 3" be optimum for torque and mileage?
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1989 Grand Waggoneer - Navy Blue<br />Stock 360, K&N, TFI, Jacobs <br />727, 229, Dana 44\'s F & R w/ 3.31\'s
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08-06-2002, 07:55 AM
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Member
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Join Date: Jul 07, 2002
Location: Seattle, WA
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Quote:
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How much backpressure does the cat really create? I believe the stock system on my 89 is a 2.5 inch. Would it be better to remove the cat and put a nice Flowmaster on with a 2.5 inch system or would 3" be optimum for torque and mileage?
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My question exactly, Nagy.
Thanks for all the opinions, guys... Giv'n me lots o' ideas.
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www.klondike-5.com
'80 Cherokee Laredo WT AMC360|MC2150|BFG33s|BJ\'s 4in Lift|&SOMEOTHERTASTYSTUFF
"Somewhere in the Neighborhood of Be"
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