what the **** are you talking about! you are saying the same thing as me!
I am saying that you want the largest piping possible for the most power! I dont know what you are saying.

 

Someone tell me why 4-1 headers cause power loss down low if running a 3" exhaust on a stock engine doesn't...

Shingo

 

okay...
i just read what u said up there about the 3" exhaust..
u stated that the 3" piping helps rite??
that IS true for turbo applications..
but for NA cars..
that is a different story...
atmospheric pressure do come into play..

 

That is incorrect. You drive an N/A teg with no other mods with a 3" cat-back and tell me that it does not feel slower. You will lose torque, not to mention the majority of the backpressure that you'd get from a smaller diameter exhaust. You do need some amount of backpressure...it's not always a bad thing.

 

Im done arguing with you people, I know Im right and Im not gonna bother explaining the physics of it to you.

 

Back pressure reduces the power output of an engine. Greater resistance in the exhaust system requires more power from the engine to pump out the exhaust gases.

Exhaust gas remaining in the cylinder after the exhaust stroke reduces the amount of fresh air/fuel mixture than can be sucked into the engine. It simply in there taking up space. Having exhaust gas remaining in the cylinder is never a good thing.

Where primarily headers and exhaust systems come in is simply for noise reduction. But there can be a benefit. Through proper tuning (tubing diameter and length) headers through a harmonic effect can better scavenge the cylinder during the exhaust stroke in certain RPM ranges

 

thank you weasel, you summed up everything I tried to say.

 

The best exhaust would probably be a resonance chamber bolted directly the head properly size to dampen the exhaust pulses out over its RPM range with a single pipe going to the back of the car

 

wow.. i can't believe the load of shit that i just read in this thread. i should close it because it's an embarrasment to the HAN community.

sinfestboy, weaselGSR, Paul, i'd like you to explain one thing to me.. if back pressure only hurts, and it's absolutely not needed at all, can you tell me why the nissan maxima had (maybe still has, i don't know) an exhaust with a valve that would close up at low rpm, and open up at higher rpm. with your almighty wisdom, can you please explain to me why they did that?

 

interesting how they didn't just leave the thing open all the time... jesus christ, some of you need to get that idiot ricer mentality out of your head and do some damned research before spewing misinformation.