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3,399 Posts (ls4 section)
IIRC the only difference between the LSx and the LS4 (5.3 in the Imp) is the crank is 13mm shorter and the accy's are moved, so any heads/valvetrain SHOULD work from a LSx engine
Theres a few people doing R&D on Wbody headers for the 5.3 right now (expect those to be about $1000 until they become more popular)

Stay away from chips, find someone to custom tune your PCM (ie ) the piggybacks are usually overpriced garbage.

Diablo makes software to tune the LS4, i think HPTuners or DHP might as well
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