We had no idea if it WAS knocking. The PCM was in programming mode ALL the time. Flashing 0.0's constantly. I went with the 3.4" pulley because at that time I had a CAI, ZZP PCM, 3" DP all the way back 3" custom exhaust, PEM's, 180*, AL104's, ZZP 1.84 RR, and other misc. stuff. I ended up going through 4...count it "4"...ZZP PCM's before I asked for my money back since I had no car for nearly 2 months in all. THEN, they told me I had to audacity to threaten them with the attorney general if I didn't get my money back for a faulty product. I got my money back BUT I also got a shattered piston out of the deal...pretty shi**y IMO...ZZP PCM's FTL...
