3" test pipe
i think they only make 60mm and 70mm heres both http://www.nopi.com/dsp_parts.php?vsubpcde...-%20Test%20Pipe
I think sticking with the 70mm is fine. The 18" of test pipe at 70mm most likely wont hamper the performance gains of a 3" exhaust. You could buy most of the parts to make one from Jegs, Vibrant and McMaster Carr. It will likely cost you over $100.
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