well i found this in what you just showed us: "
This is how aftermarket exhausts can cause a loss in low end power. Incorrectly sized exhaust pipes can disrupt the airflow, allowing exhaust gasses to be sucked back in during this valve overlap period."
"For most N/A applications this pipe size would be 2.25" in diameter. A common mistake sometimes talked about in "tuner" magazines is that you need some backpressure for the system to flow properly. This is a myth created by amateur testing methods."
"
This would be another one for the Magazine Mechanics. "This muffler will reduce backpressure and you'll see at least 15-20HP with this ultimate free flowing design!" By now I hope we can see what a big fat load of crap that is. In the stock exhaust system, the pulses have already been jammed together, and the backpressure has already affected the engine. So you change your muffler to a better flowing one, so what? The amount of backpressure in the exhaust system remains unchanged. You're just putting a fire hose at the end of a garden hose, the flow remains unchanged. So unless your exhaust has reduced backpressure enough so that the muffler becomes a restriction, then changing the muffler to a "free flowing" design will have no effect on real-world performance."
on this page: http://www.team-integra.net/sections...p?ArticleID=47
did you even read this stuff before you posted?!
Last edited by burnrubber; Aug 14, 2006 at 06:04 PM.