Exhaust System Back-Pressure

I am just wondering how opening up your exhaust system effects your engine. I thought that a lack of backpressure was bad for the engine, and does it effect HP at all? I had a broken exhaust on my sentra the other day (right after the exhaust manifold) and the power curve was dramatically changed. Part throttle response was poor, while full-throttle was slightly improved.

Anyone want to explain the effects of back-pressure (or lack of it) on an engine?

Thanks in advance...

http://www.automotiveforums.com/vbulletin/showthread.php?s=&threadid=13199&highlight=delta+pressure
It's a thread I found a while ago that should answer all your questions.:licker:

Originally posted by YellowMaranello
http://www.automotiveforums.com/vbulletin/showthread.php?s=&threadid=13199&highlight=delta+pressure
It's a thread I found a while ago that should answer all your questions.:licker:

Thanks, thats exactly what I was looking for. :)

note to self, use search function more often....

Originally posted by HuMMerMan

note to self, use search function more often....
:p