i have a friend who got an altima test pipe for his p11 and its still about .5in to 1in off. From what I know on ebay the altima test pipe is 16in long flange to flange
oh yea, forgot to ask, since im using a tuned 95 b14 ecu with my turbo swap, i know i have to change pins for the rear o2 sensor. since the b14 rear o2 sensor is the smaller 12mm one, does it bolt on the s13 o2 sensor bung on the test pipe