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Installed the Corsa (4) 4'" system yesterday. It is great.
In answer to your question, it appears that when your car was made is the key, for mine was one of the first ones and it required cutting off the last 2 3/4" (as per installation directions) on the passenger side. However, the Z's made more recently than mine (sorry don't know the exact date) do not require any cutting. The directions are good, though the sockets referred to under the needed tools section need to be deep sockets. Also, when the directions say you will need two folks, they couldn't be more correct. If you yet don't have a copy of the install directions you can log onto their web site and download them. Finally, during the install had a couple of questions and I called the Corsa tech line. Jeff was great and answered both of them perfectly.
Lastly, the installed system is everything I wanted it to be. Nice idle, quiet when I wanted it to be, yet loud/ferocious under full idle. Best of all no resonance drone around 1,500 RPM (which is what my Z had when I removed the fuse on the factory system).
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