i have an 99 EM1 with a knockoff ITR (2.5) header with an Greddy Evo2 (2.36?) exhaust. i want to get a test pipe . whast size should i go with? 2.5 or a 2.36?
also with the test pipe everything should bolt together with now problem?

 

The test pipe will need to decend from 2.5 to 2.36 to connect em'. right?

 

just go straight 2.36

 

thanks for the advice!!! so go with the 2.36?