RrCoX22

iTrader: (6)

what kind of hp gains should i see if i was to swap on some lt's (pacesetters). '99 m6 z-28, engine is stock with no serious mods.

natronathon

depends on what type of exhaust you have behind the pacesetters. At the least you will have to get a new ypipe. I reccomend going with true duals, but here is what you prolly see without a tune

Pacesetters + true duals = ~25-30+ rwhp gain
pacesetters + ypipe = ~ 15 - 20 rwhp gain
pacesetters + ypipe + good catback (no flowmasters) = ~20-25 rwhp gain

PendragonZ

You'll gain 25-30 or so right now, but when you go heads/cam, it really makes a huge difference, letting the engine breath.