22 Apr 08, 06:36 pm
hillbillydodge Wrote:why a muffler at all?? :whistle:
Your engine needs some backpressure to produce torque. Put it on a dyno with no muffler or cat, and your horsepower will be higher, but torque will be pathetic.
Note: I'm doing this with a Diesel, but it's got a turbocharger to give it some backpressure to work against.