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Message: <blockquote data-quote="andrewk" data-source="post: 449674" data-attributes="member: 3188">I guess the easiest performance upgrade is to get the engine to breath better - change to a air filter with better air flow and change your exhaust system.  That should get you slightly better HP (and I mean slightly) without too much moolah.  Also doesn't screw up the stock engine management.  You can get aftermarket filters like K&Ns and go to Sunway for custom pipes.There is a thread somewhere in the forum about remap, and a few members already done it.  Try using the search function and look up "Upsolute".  They have done it on the M52 of an E39, so should not be a problem on ours I think.  But 30%.... unless you have a GTR whose stock engine is designed to handle much more in stock form than it's artificially limited factory numbers, I doubt it la....my 2 kupang....</blockquote>