Rob,I know this shoulds like a cliche, but I would concentrate on your intake and exhaust. They are pretty easy to modify on the '02 Altima. The '02 Altima has a big restriction from where the header meets the exhaust piping. It appears in the small section that its crimped. I am sure they did it for emissions. Does your state have emissions testing?nlzmo400r wrote:actually i was thinking of relocating my knock sensor if i try to make more power, i know it has been done on spec Vs in the past, but will it generate a problem with my altima?