Well my testing with these 3" mufflers is done and before I begin here is a quick breakdown on my setup.
DART 331
TFS 185 CNC
Freezy 74 camshaft
Edelbrock RPMII intake
ProCharger D1@20psi
Snow Performance Stage 3 water/methanol w/Boost Juice (50/50)
MSD 6AL-2 Programmable
MSD HV coil...
no he picked up 45whp when he switched to the 3" system over the 2.5". he picked up 45hp just swapping the mac mufflers with out tuning. when he retuned he picked up more. 75 to be exact. i don't know where i got 82 from lol.
final
Magnaflow: Run 121 and 122
MAC Flowpaths: Run 128
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