your not getting it are you. you want backpressure in a street car. unless your turbo, then it wont matter. but somehow your gonna try and tell me im wrong and blah blah blah. well your wrong. this guy is asking about these mufflers for his 2.4 cobalt, not his drag car. so I know you wanna sound all smart with your "Knowledge" but its not answering this guys question.

and to answer your question, race cars run open headers, cause at High RPMs you dont need backpress to make power. unfortuantly on the street you need to.

 

Because race cars spend 80-100% of their time at WOT where open headers will create the most power. While a street car does not. Some back pressure is a good thing for low rpm torque production. I dont know about you but im not wide open very often on the street. So I kind of like having my low end torque. Will I reduce my back pressure? Of course. Will I aim to get rid of it altogether hell no.

 

pshh open header, open HEAD is where its at

 

 

God damn you dont want backpressure in a street car, drag car, or any car. Properly sized piping will keep exhaust at maximum velocity for your application and provide the best scavenging possible. You dont want to contaminate the intake charge. No matter what you guys say, this same principle still applies. And LS6rally why do you think my first post said /threadjack. I was not aiming to answer his question, yet im trying to explain why backpressure is not needed but properly sized piping is. You need to have the lowest backpressure possible to produce the maximum power by keeping pumping losses low. Too big of an exhaust pipe causes power loss, especially low-end torque. Thats because a big pipe has less exhaust stream velocity than a smaller pipe. Velocity is essential to get the best scavenging (or sucking) effect from tuned exhaust which is why properly sized piping is the key factor.

 

[QUOTE=BLAZIN07SS;4527001]have you studied exhaust theory at all? backpressure is simply defined as resistance to positive flow. you want exhaust gases to exit the combustion chamber as fast as possible. how do you do this? by picking a properly sized pipe to increase exhaust velocity while maintaining as little backpressure as possible. backpressure is essentially choking the car in the top end. you want positive flow, not something holding it back therefore backpressure is the enemy. you dont want it, at all![/QUOTE]

this si the statement you made. and it is wrong. and then you said you never said that, so this is why im busting your *****.

No backpressure= no low end torque. so now explain why i want no backpressure on my daily driver?

 

Don't buy those pieces of ****! Get something like a Magnaflow Muffler. I had 2 Magnaflow Mufflers (Dual Exhausts) part number: 14826 on my old 2.4L Cobalt, and it sounded badass, and looked great!

 

okay if thats all you can pick at, your just another one of the idiots on this forum. minuscule amounts of backpressure is what we were talking about here. you guys are making it sound like we need 6 baffled mufflers to have any low end torque. i dont even know why i argue with you guys, its completely pointless

 

because you say stupid things

 

you're such a tough guy

 

not tryong to be tough, just trying to get it through your head that backpressure is needed in a street application. and all you can say is the properly sized pipe.... so do you drive with a properly sized pipe and no cat or muffler on your N/A car?

 

what you dont understand is the properly sized pipe for your application provides that minimal amount of backpressure. backpressure through mufflers and other crap is not necessarily needed

 

ok so do you have the properly sized pipe on your car, with no muffler or cat?

 

proper for my nitrous set-up, not proper for off bottle. pacesetter header w/ 3 inch collector, 3 inch catless downpipe, 2.5 inch straight through cat-back with a blown out muffler

 

4-1 or 4-2-1 header?

 

4-1. i would have gotten the CIA 4-2-1 header but the collector is not big enough