OutlawDrifter
Long Roof K2500 Driver
Frieburger has an Engine Masters 2.5" vs 3" exhaust video on youtube. They are using a 620hp solid roller 454. The part I find comical is where they are discussing it being ran wide open and how the power under 3500rpm picked up with the 2.5" exhaust doesn't matter. And it only lost 20hp with full 2.5" exhaust that's a 3% loss over open headers with extensions, and I would be less on lower HP engine/setup.
A 620hp solid roller carb'd BBC doesn't really match a cammed Vortec 454 with stock injection that will spend most of its life under 4k rpm.
Optimizing the scavenging where the engine spends 80%+ of its time is important when building the exhaust system.
I take a different approach for our dirt track hobby stocks, than I do for my daily drivers.
A 620hp solid roller carb'd BBC doesn't really match a cammed Vortec 454 with stock injection that will spend most of its life under 4k rpm.
Optimizing the scavenging where the engine spends 80%+ of its time is important when building the exhaust system.
I take a different approach for our dirt track hobby stocks, than I do for my daily drivers.