backpressure keeps comming up in some of the conversation I have with people. I have somewhat of an idea of how it affects the car meaning zero backpressure is good for high end horsepower vs. some packpressure is good for torque? Can anyone give me a little more details on that?

 

it's hard to explain in short, but zero is what your looking for. the bad part is zero backpressure isn't possible at all rpm. once exhaust flow is at it's max velocity, anything more than that will be backpressure. think of using a firemans 3 inch hose to water your lawn. at low volume (similar to low rpm) the water will more or less trickle out as compared to using your usuall small water hose. unfortunatly the small hose as volume would increase such as putting your water hose to a fire hydrent, the water speed will only stay the same and get nowhere near enough out yet the large hose will flow it fast and at high volume. you can't gain velocity until the pipe is full which at low rpm big piping and no muffler (like a loudmouth) is releasing the exhaust is full. with a muffler, it holds a bit back and slow's it down even with the same size pipe, unfortunatly this commonly hinders higher volume (higher rpm) of exhaust gases slowing the exhaust down and lowering it's velocity, which hinders power.

 

I understand, that's interesting, i always thought only turbo charged cars had backpressure problems......thanks a lot for the quick answer, it helps a lot......