Does it make any difference what size downpipe you have 3" vs a 4" downpipe? Is there any performance difference?
Fwiw, I agree 100%. Last year at Tx2K1, I put down 685rwhp with a 3" dp.Lagtime said:A 3" DP will flow all you need for a car still on stock turbos, the 4" pipe would be a waste of time and money.
Also, there is no such thing as too little backpressure on a turbo car.
Just buy one of the 3" mandrel bent DP's and move on.