http://www.dsm-performance.com/catalog/garrettdsm.php   Good reading.

Could someone fill me in on wide band o2's. Are they just used on dynos? Do people use them in their car? I have read their very accurate, but also heard their price is heavy. I just need to be filled in on wide band o2's. I'm going to be running 450-500hp next year and I know nothing about wide band o2's. ignorance is bliss and a recipe for disaster.   thanks all, Kevin 88 red esi-r 88 purple tsi

i'm looking for some low budget mods i've gutted the cats and opened my air can. what else can i do to get more power

I have a line on new Stainless Steel Valves .5mm oversize for hydraulic rockers. The price would be $140 delivered.  Full set of 8 valves.  No Jet Valves.   To use these, you should have your valve seats cut oversize.  My machinist will charge me about $25.   I think the performance gain would be marginal if any, but you can't go too big or you would need very heavy valve springs and that would drastically shorten the life of your cam.     We would need 5 orders to get the price.   Befo