Originally posted by 88Vic
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The 99-04 GT cams are the same grind, no gain.
Porting modular heads is no simple affair, it is very costly and there are only a select few who get it right. The intake is plastic, so I wouldn't want to port it too much :p Regardless, the PI intake flows great in stock form.
If he has dual exhaust, leave it for now. Upgrading to 2.25 over the factory duals won't gain him much. If he has single exhaust, then go for it.
There is only one header option, and that is Kooks. They are long tube and will require a mostly custom exhaust behind it. They run over a grand. I would start with some of the more simple mods first.
If he has single exhaust, he has a 2.73 RAR - change it out for 3.55s for some better off the line power. Might as well throw in a trac-lok at the same time.
If his GMQ is a 2005+, get a 2004+ CVPI airbox/MAF and a tune for it from www.blueovalchips.com
If it's a 03-04, get a Marauder airbox and MAF along with a tune.
The steeper gears, and new airbox and tune will make a huge difference. The duals won't make as noticeable of an impact, but it's a good building block to work from.
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