2 1/2" vs 3" Exhaust Comparison Video

abodyjoe said

below 3200 the smaller pipe is better... other than that on a 620 horse motor the 3" is as close to open headers as can be while the 2.5" killed 20hp. no real surprise there..

why don't they try it on a 350-400 horse motor? that would be more the regular guy type of power..

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I totally agree. They should do it on something more typical of a street car.

Although, if you're pushing over 600 HP and it's a street driven car. I wouldn't care to losing 20 HP if it makes the drivability more pleasant (i.e. quieter), although others may differ. They may not mind the extra noise.