What is the size of the collector for the stock b16a1 header? I am going to make a test pipe and need to know what size it is.

 

check your pms my man, turn off popup blocker....hahah

 

2inch maybe?

 

Same size or ur Pippin .... i'm running 2 1/4 under all the way.. i have a cAT but its gutted out. same thing as the test pipe... i had one before and it was the same size of my pipping .. like i said... same size