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http://www.intense-racing.com/ (ls4 section)
http://cartuning.ca/
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 www.getoverkilled.ca ) the piggybacks are usually overpriced garbage.
Diablo makes software to tune the LS4, i think HPTuners or DHP might as well
http://cartuning.ca/
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 www.getoverkilled.ca ) the piggybacks are usually overpriced garbage.
Diablo makes software to tune the LS4, i think HPTuners or DHP might as well
