Thread: GTP Knocking Sound. Any Ideas?

Cant figure out this knocking noise. I have a 2002 gtp. I have ssac headers, 3 inch downpipe, no cat, no res, stock mufflers, 180* tstat, k&n cai, zzp stage 1 throttle body, dhp 1.0 pcm, 3.4" pulley, fuel pump re wire, alt re wire. I have a knocking noise from 2500 rpms to about 4000 rpms. it doesnt do it after 4000 rpms and it doesnt do it before 2500 rpms. i cant figure out what it is. any ideas on what it is or any suggestions how to fix it? please help

I cant tell if its coming from the front or back. What could it be in front? what could it be in back? It doesn't do it in park. Only in drive. Its most noticeable in drive. Thanks for replies