[blykins]

Jerry, put an engine on an engine dyno with good headers and exhaust, and then dyno it again with a set of Cobra headers and sidepipes. No, it's not driveline loss, but I see parasitic loss as anything that takes horsepower to use it.

If you take a fresh engine and put it in a car, then put it on a chassis dyno....what's going to be different? Driveline loss and full exhaust loss.

I agree with you 100%....I try to dyno engines with the headers that will be used on the car. Unfortunately, the way that dynos are laid out, a customer can't just run in with a set of mufflers and tailpipes and say that he/she wants it exactly how it will be in the car.

However, put a Cobra on a chassis dyno with a set of Cobra headers/sidepipes. I guarantee that they'll be more loss than if you were running normal full length headers and good mufflers. I would say that there would be a 4-6% difference. That's the 22% that I was referring to.