i put them on my 00acr w/high flo cats and catbacks, all tnt, also a vec1 and gained about 25 hp on the dyno (hp-411 to 435, tq-458 to 477)....i wouldn't expect more with a 00...big throttle response feel difference but you will get the o2 heater failure engine light problem, i have still not gotten rid of it, counter to some other post i was on the dyno cleared the code and there was no hp diff...some folks say they loose power when the light comes on...the car definitely runs richs when it comes on and i adjust my vec1 and seems to do fine...i am waiting to get one of the new mopar ecus when they come out someday!! the system is pretty loud, i like it! i put mine on by myself and it took a weekend, i could probably do it in half the time now that i have done it once...
