This board has sparked my need for add ons.

Does anyone have a site in which you can buy special parts for HP boosts and such?

Thanks in advance

Joshua

Lots of owners have installed 'cold air intakes' and throttle body spacers on their 4.2's. My personal opinion is they will do nothing for your computer controlled 4.2L. If you like them for their looks? It's all good! You can also buy a replacement ECM or have your ECM reprogrammed or 'tuned'. Again.. my personal opinion is you drive a trailblazer. She is what she is!:iceslolan Oh... check with the fine folks over at trailvoy dot calm for info on mods. Great forum.

Joel

Get a tune from PCM4Less or Wait4Me. Best performance upgrade period for a 4.2L I6 engine, hands down. Nothing gets close at all. Cost is $150 for a PCM4Less tune with an extra PCM core so you do not have to send them your PCM. Install takes 10min, crank relearn is another 30min (if you get a used PCM, new ones dont need this), and a CASE relearn from anyone with a Tech II (or any device that can do a CASE relearn) is anywhere from $0-60 depending on place.