The stock 370z piping is all 2.25 inches, ours is 2.5 inches throughout the whole exhaust.
The X Pipe features, smooth radius bends to help ensure smooth exhaust gas energy. Special attention was taken to design it this way since this could be a huge problem with exhaust flow if it isn't done correctly.
The tone is a bit louder and you should see some increase in power. Honestly at the price I am currently selling the full exhaust no reason not to get the most bang for buck.
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