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When I was researching the 2 I4 motors, the only two differences are the exhaust and PCM. From what I saw the exhaust on the z3 is noticably larger and is louder than the z2 exhaust. The PCM although I dont know for sure, does seem to be just an increase in redline to take advantage of the larger exhaust breathing better.
I went through estore.honda.com to look for different part numbers and the PCM and exhaust were the only part numbers that were different.
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