My .02c...
For the last 3 days I have had a BBK L/T setup, Mac Prochamber, and Flowmaster 40s. I really loved the sound up to about 3500-3750rpm. Im still breaking in my clutch, so I dont take it much past 4000, but I have hit close to 5000 a few times and I was not thrilled on the sound. It got really high pitched and poppy sounding

. As I said though, up to 3750rpm its

!
I now have BBK L/T's, BBK hi flow catted mid, and flowmaster 40's since thats what I originally paid for. The Mac was used since the pipe we had didnt fit correctly. The new one went on this am and its not as

sounding, but it sounds better at higher rpms IMO.
Also with the Prochamber my car felt a little slower

at low rpms. Like it just didnt want to pull that hard. High rpms, it pulled like mad. Now with the BBK piece it pulls just as hard at low rpms as it does at high rpms. Dont know if the lack of cats killed my low end torque or what, but I definately feel more a pull with the BBK hi flow catted piece which is strange. Ill probably buy the Mac piece though just for the sound

. That would be a neat idea... dyno both the Mac and BBK piece someday... yeah I might can make that happen
