Well ever since I put my turbo on I have been running a pretty restrictive exhaust I think. It starts out as 3.5" down pipe and steps down to 3" crush bent pipe by a local shop. That runs into a si/do 14" magnaflow with dual crush bent 2.5 inch tail pipes.
New setup I am ditching everything up to the down pipe and going from the 3.5 down pipe stepping up to 4" mandrel pipe with a big straight through muffler and then dumped before axle. Just wonder how big of an improvement this will be in HP and possible track times. And how much my tune will be affected. Lemme know what yall think.