xrglen

Has Or Does Anyone Know The Power Diference Between These Two Extractors If Running A 378c With 248@50" Cam And 2v Heads That Flow 560hp. I Know One Is 1 3/4 And The Other 1 7/8.
Im Also Running A Twin 3" Exhaust.
What Do The Guys With 3v Heads Run., And What Does Everyone Else Run On Their Tough Clevos. Cheers

brenx

At the crank it'll be around 10-30hp gain if the engine needs the bigger pipes. If it don't need it? You'll go backwards. My current setup looses around 25-30 crank hp with the smaller pipes.

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XB Fairmont (street car) 11.07@123.02mph.

xdclevo

With that combo, you will probably make more torque with the smaller pipes, but depends what you're doing i spose.