Well first off I just got my front mount in and tuned a little over a week ago and and so far I'm loving it. When I installed it I just drove to the exhaust shop and got him to pretty just fix me up for as cheap as possible until I could put a big exhaust under it. So this is what I have. Starts as 3.5 inch down pipe. Exhaust guy added about 2 feet of straight 3.5 after that cuz he can't bend it. The it steps down to a single 3" into a single in dual out 14" magnaflow. Dual 2.5" tail pipes out the back. So what I won't to know how bad is this exhaust hurting my setup with backpressure and how much could I gain going to a 3.5-4" exhaust? Thanx

 

General rule with turbo is you want single pipe to be at least as big as the exhaust outlet. Dual pipes can be a little smaller.

 

yea you should have went with at least 3 inch pipes after the muffer imo