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in 2006 the 350z got a new motor that redlines at 7000 instead of 6500 like normal.
a whole bunch of new improvements and motor changes so im told.
also certain mods like the plenium spacer im told don't help at all.
just gotta be more picky with what you buy is all.
hope that helps!
PS.... My roommate is hella pissed, he spent 2 days installing his headers.
when he looked down past my spark plugs and saw these headers sitting there he about **** a brick. he was so mad that I had them and diden't know it and he spent all that time installing his. Makes me laugh lol
They make like 10whp.. You need tp's or hfc's to compliment those headers.. Theres a few dyno's showing a loss of power from just headers. The tp's or hfc's will bring it back with a little gain through out, and like 14whp peak gain.