couple notes on the on3 kit, might want to wait until they release them for awhile, so they can work out the bugs. i heard they had bugs with both thier kits that were released to start with but it looks like they've all been resolved. also, consider getting the MasterPower turbo upgrade, its only like 269$ extra, and totally worth it for a known reliable turbo. with the 2v numbers from the graphs he supplied me with, are showing 10psi @ 440/496, with the 3v, im sure you'll have plenty extra at 8psi-10psi.
im not really too familiar with the s197's, or how much room there is, but on the 99-04's, you need a tubular front end and coilovers for it to fit. IIRC s197's already have coilovers. -- this adds to the overall cost of the 2v kit, as well as needing fuel pump, fuel injectors, tune, gauges, and when alls said and done, its probably closer to about $3000 - $3500. still, in my opinion a better option than the vortech (new that is, maybe not used) as you have more to grow if you plan on it, or decide to later. plus im just a fan of the way a turbo feels.
if you have questions, email chad at
on3performance@aol.com. im not sure if he has a user name on this forum, but i know he does over at
www.theturboforums.com, so you can contact him there too.
*note* i dont have this kit *yet* but im ordering it as soon as i get back from yet another round of training (bleh, gotta love the military)