ok guys ......all you guys making test pipes and headers.......... what are the internal diameters of the test pipe, and header collecter size??????

also .. what is the internal diameter of the borla true dual exhaust?????

i would like to know because i belive in running a constant setup, using the same size diameter from the header collecter... all the way to the rear of the car........ leading to a nice, consistent flow of air............... so if u guys could mabe post up some sizes... im sure theres a few other people on here that would like to know this as well ..... ok thnkas guys!!!!

 

The cat pipes we make are 2.25" diameter. The headers we are making currently are also 2.25" diameter. The factory headers though have an outlet of something about around 1.75" diameter, which is very small. I am almost certain that the true dual exhausts have 2.25" all the way back.

 

factory collecter is 1.75????? that is small....... 2.25 sound like a pretty ideal size for this engine ...... im looking foward to seeing what kind of numbers will come out of 2.25 all the way back collecter----->cat--------->exaust maybee 35+ ????????

time will tell