Quote Originally Posted by Chris_F View Post
lol, then you'd loose power...



Do you mean system 1 is quieter and flows more?

But that's the problem. You can't just add up the individual flow of each muffler and say one flows better than the other. It's more complex than that. How about the increased turbulance created by the y-join? The reduction in velocity of exhaust gases caused by splitting the exhaust gasses and forcing them to twist and bend through the extra piping and the extra muffler?

Also, faster traveling exhaust gases will create a scavenging effect that pulls subsequent exhaust pulses through the exhaust.

My main point though: if there was a true performance benift to a dual outlet exhaust on a 4 cylinder car (not talking about noise reduction or looks) why don't all of the tuners who are obsessed with extracting every last HP out of the k-series go with a dual outlet design?

By the way, I'm not saying that a dual outlet exhaust can't flow just aswell as a single (depending on the design). I'm saying that a single outlet exhaust is all that's needed regardless of the power figure you are chasing. It's also more straight forward to design a single outlet exhaust that will give you the flow you need for your setup.
Quote Originally Posted by Chris_F View Post
Well if the gas splits after the Y wouldn't the energy/velocity of the gass travelling through the pipe is also split into two. It then has to travel through twice as many bends and mufflers before it exits the system. It adds complexity and that hinders flow for sure.

A well designed dual outlet should be able to flow very well, I'm just saying a single outlet exhaust shouldn't be a restriction by the simple fact that it is single outlet. (from the research I've done there should be no performance benifit of going to a dual exhaust if both systems are well designed)
nah i was just saying that up until a certain point, a dual system can flow more than a single... where that point is i dont know, and its going to vary greatly depending on the quality and design of each system... i was merely trying to point out that two quiet/restrictive mufflers can flow better than a single loud/free flowing muffler...

and yes it will get more complicated with pipe diameter and tuned lenghts and bends/joins etc. but unless someone needs maximum power, and can handle the noise, a straight thru 3" system prob isnt the best for street lol