I installed these before I heard all these horror stories. Since then I have upper RPM band HP. I can't even get up to the governor speed. On acceleration I hear a buzz/rattling from the engine bay. (this only happens while the car is in gear) Long and short of it is that my V6 is slower than my Ztec. Should also be noted that when the engine is cold and I start to drive I get a stuter in the acceleration, If I keep my foot on the gas in the same position it'll start moving then slow down a little followed a some serious power recovery. Question here is could this all be related to the quad 4 plugs that I installed?

hunter green 96 mystique mtx, sabb side markers deep tints
car bra., K & N filter, hyper white low beams, after market fogs, JVC Kameleon head unit, 600 watt amp with 2 10" kicker subs, soon to come new rims

New adition 01/11/2002 The original 95SE in Midnight Red all the toys including traction control
Fog light mod, lightmoonroof switch from a focus, power antena (still wiring it up) post 98 sail panels, new water pump , Bosch quad plaitnum plugs, and a new Cat.