I just put a 5.0 litre into my 81 380 SL. I got problem with my exhaust system. I had to modified the exhaust manifolds to match the exhaust ports, everything else works great. I took the car to a muffler shop to extend the pipes for temporary use. The right pipe got 1.5" extended from the vertical portion just below the pre-catalytic converter to clear the chassis, and the left pipe got 2" extended right before the connection to the right pipe. They go together to the main catalytic converter. My exhaust system is not really in a good shape anyway. I have looked some exhaust systems in Timevalve catalog, I cannot put 380 SL exhaust system in my car since it is short. I am interested in 560 SL system in which the left pipe is curved under the transmission . My question is if I put a 560 SL system in my car, do I encounter any problems? Thank you!

By the way, my car accelerates very fast at the stop to cruise speed. I get around 15 miles/gallon.

kctme