Wondering what size piping I should install 2.50'' or 2.25'' got a 4-2-1 header hi flow cat and a off brand muffler just undecided as to what size piping to get. I was told that if i got 2.50'' I would lose back pressure and to only get it if I planned to get turbo but I have no plans of going turbo right now car is factory.

 

i did 2.5 on my teg and it runs jus fine.u wont lose any back pressure if u do that size.if u do 3 inch then u will.