What is the biggest attraction for aftermarket? Intake, exhaust, headers, ported/polished heads? I build a lot of custom parts for my caprice's and other project cars. I do my own in house porting and polishing as well as assembly and fabircation. I was already toying with the idea of new body parts but here in chicago, fiberglass bumpers on an everyday driver is not a good idea. I would have to say the first place to start would be a bigger air/oil intercooler. Any suggestions?