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Just different I guess. I went with cam (Comp Cam 232/236 585 lift on 113 LSA) and valve springs (918s) first since I don't care for loud exhaust all the time. With tuning on a DynoJet 248 dyno, RWHP went from 347 stock to 380 with cam and stock exhaust. I have since changed cams (small SC cam 218/226 560 lift on 115 LSA) and added an ATI SC kit from Andy at A&A. RWHP with completely stock exhaust through the tail pipe tips is now 587 with RWTQ at 499 lb.ft. The exhaust seems to keep up quite well.
If you want more rumble then by all means get exhaust first.
Later ... Larry S.
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TR '04 Z06 - Procharger P1SC by Next Level Performance
607 RWHP 507 RWTQ. Stock exhaust, Comp Cam 218/226 on 115 LSA.
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