Stupid question and I apologize.. I have a greddy dual Ti-c exhaust and I want to install the test pipe with the new header and flash... So which diameter test pipe do I need with my exhaust since they come in both 60 and 70mm
thanks in advance
chris

 

If your exhaust is 70mm, get a 70mm test pipe.

Always match your test pipe to your exhaust (same size) to reduce turbulence.

 

That would be the problem lol.. i never measured the diameter of the start of the exhaust at the cat meeting point prior to installation... and there isn't jack on greddys page for info

 

never mind found it

 

70mm all around.