What are some piping diameters for various brand of up pipes ? Im in the market for an up pipe and would like to know some specs for companies like Perrin and Crucial Racing Systems (which i belive is 1.75"). Whats the ideal inner diameter for a WRX with the stock turbo and how big is too big in regards to up pipes, if there is such a thing as a really big up pipe.

 

Usually they tell you the pipe diameter.

Are you going to upgrade your turbo?


click me

 

TurboXS uppipe claims to be the same size as the turbo inlet, at 45mm ID

 

The Crucial pipe is 1.75".

 

Haha mine, an off-brand, comes in at 2.5" lol


I figured there would be some turbulence but the main thing was to remove that cat

 

I've got the helix flex uppipe, and i just measured the inner diameter to be 1 7/8". Kinda small, but i guess it keeps the velocity up.

 

ding ding ding, velocity is key in this situation. which is the reason aps uses a taper in thier upipe, thier trying to speed up velocity, which i feel is a gimick...where ever the smallest diameter in your upipe is, is the diameter of your upipe. i bieleve the general conscencous is that an upipe starts to loose efficiency or velocity at a little more then 2" on the stock turbo.