Yeah my plugs were pretty bad.The ceramic insulator thing had turned brown and they were just plain ugly.Plus they were autolites, which suck.As far as performance mods, i have a PCP CAI, accel wires, and a custom OBX exhuast.I have stock 97 GST rims also and am lowered on Sprint springs.My muffler came with a removeable silencer that unbolts to let flow through or not, So i took that out.