Added more discs, now running a total of 30. According to the manufacturer 20-24 should be equal to an open pipe. Pulled pretty well into 3rd gear today, hope to try it on the eighth mile track. Can't hear any rasp from inside yet. I can hear the "sound" of the Borla thru it all, though.
1999 GLS MP90 supercharged / 2003 GL MP62 supercharged / 2004 GLS stock
Magnuson MP90 / TOG's / 3 in. Magnaflow exhaust / MSD ignition / LS1 MAF / Racetronix pump / HP Tuners / TCE 68mm TB / 36 lb Inj
= Best track time: 12.951 @ 104.48, 1.839 60 ft. (Beech Bend Raceway Park, 11-23-13), 50 Deg. F