Markus, what's your goal? Looks or performance? Dual exit chrome slip-on tail pipe tips can be had after market or a muffler shop can make you one from exh tubing cheap. For performance I would go with a full dual exh system (with a balance/crossover "H" pipe installed as close to the exh manifolds as possible. I would plumb both the exh pipes down the right side (stock location) of a Wag. A lot cleaner and cheaper than routing the left side past the fuel tank. I would go with 2 1/4 or 2 1/2 inch plumbing for true duals. Or cheaper/easier yet run a stock single exh configuration using 3" pipe. Any local muffler shop can fix you up.
"Don't mind me. I'm just here for the alibi"