Hello, I have a question I couldn't yet find the answer to:
if I was running efr's 6758 with up to 700 lb ft how much would I gain or loose by using either stock exhaust or aftermarked exhaust (lets say 4")
...connected to 3" catless dp's and twin 200 cell cats silenced y-pipe.
my main concern is noise which I have to keep down due to regulations here. So if I was to change the exhaust I would only do it for power
(Only quiet 4" exhaust on the marked seems to be the Litchfield one!?)