I've only had the K&N on for the past 20k or so, the exhaust was done about 12k ago, and its only been programmed for the last 4-6k, I cant really imagine it wearing out *that* quickly. I dont drive a lot (telecommute from home full time), and when I do, I try not to be abusive (cops around here are pretty strict), but I do on occasion stick my foot in it.

The main goal of the performance mods was to bring it back up to "normal" after sticking 31" tires on 3.07 diff gears. Yeah yeah, I know swap the gears, I just wasnt comfortable with the black art of setting up a ring and pinion myself, though doing the spider gears wasnt too bad.

Back to the knocking, it completely disappeared a couple times over the past few days, then came back, seemingly at random. For instance, it was doing it when I started it up this morning to take girl home, wasnt doing it at a stop light 4 blocks from my house on the way back, and was doing it when I pulled in the driveway 3 minutes later. Its not just the location (driveway), as I have heard it at several stop lights/signs with nothing close for sound to bounce off, the exhaust is too loud to hear much of anything at speed. Frustrating, very frustrating. <img src="/forums/images/graemlins/scared.gif" alt="" />