ATC 90 exhaust diameter.

[81ATC185S]

I need to know the inner and outer diameter of atc 90 exhaust as I am going to make my own straight pipe with resonator. What is the biggest size pipe I can fit on the stock head?

[John_Neary]

Gonna give my 2c since no one has responded yet. Measure the diameter of the largest part of your exhaust port and that will give you a good idea for the head pipe inner diameter starting size.


edit - Ignore the photo of below, it was not the one i meant to attach and for some reason the website will not let me delete it.

[barnett468]

I need to know the inner and outer diameter of atc 90 exhaust as I am going to make my own straight pipe with resonator. What is the biggest size pipe I can fit on the stock head?

why do you want to run the biggest pipe you can?

bigger is not always better, if you make it too big, you will loose power because the exhaust velocity will be slower than what is optimal which will reduce the amount of scavenging it produces.

[81ATC185S]

I don't want to run the biggest pipe, I want to go 1 size up. Ill just get my micrometer out and figure out inner and outer diameter.