I want to know which is louder, a dual exhaust with can mufflers or a single with a can muffler? Also, my friend was getting a dual exhaust for his cobalt but he was told that a dual exhaust will not increase flow, is it true that a dual exhaust will not increase flow on a car designed with a single?

 

from my experience dual exhausts are louder and do not increase flow at all. i'm sure this is very vehicle specific, though.

 

well first off the Evo X/upcoming Ralliart isnt a true dual exhaust, its a single exhaust pipe with a dual exit muffler, so if thats what you wanted to go for it, but it seems you want to add another pipe and have to exhuast canitsters, I wouldnt do it NA, you may lose some needed torque that way.

 

Think about it.

The car is designed to exhale a certain amount of air. Even if you put 87 exhausts on the car, the motor is still going to exhale the same amount of air. It'll leave easier, yes. But the only way it'll increase flow is if the stock was restricted somehow (in which case, a better single exhaust would do just as much).

 

for the lancer , do not do a Y configuration exhaust, where you split the pipe flow into two canister situation, you will distrupt exhaust flow and reduce performance for our NA 4cyl. Its simple to do but rapes performance. The best way to go about it is a single canister. Which is almost the same as a a single pipe exhaust like your stock muffler just with the addition of a second outlet.

so with what was said yesterday, a single canister route is not a true dual exhaust

 

so why exactly would the Y configuration reduce performance?does it have something to do with back pressure?

 

like other guys said the evo is made for one (single)exhaust,,cuz its 4cylinder...and from the engine goes into one manifold and then one downpipe,,,and then it exhales still the same amount of air...but cars like ferrari,lambos,porsches and other muscle cars are 8 , 10 or 12 cylinders and each pair has his own manifold,,,so there are two manifolds, and two downpipes under the car...which every could be split into two..so you`ll see 4 exhaust. but it has just two single downpipes or some cars have xpipe...

 

to go a step further on dinos comment. when it comes to exhaust flow, its almost impossible to get a proper split that exhaust flow will endure to maintain undisrupted flow. Exhaust flow is very different from volume flow like you get with an intake or with what you see in what flow as it creates a whirlpool. Exhaust flow is pulses of high and low pressure if their is a fork in the path it causes massive disruption to the optimal order of things. You get disruption and back log which has a compounding effect on performance. This is why a single canister is better because it allows for a pooling of the flow and if the muffler is properly designed, sound properties can be played with to modify sound, louder, or quieter, less vibration...

you get the idea

 

since you all obviously know a lot more than i do about this..im getting the GT concept rear bumper and side skirts

so obviously it has a spot for duals in the back..so heres my question

i already have the greddy axle back exhaust is that gonna create a major problem? will i have to remove the axle back? or can i run the 2 pipes and take off the greddy exhaust tip and say maybe put 2 HKS mufflers on there? and not loose performance? what should i do in this situation to not loose performance

 

Keep the stock configuration.

If you switch to doubles, you're going to lose lowend power. No way around it. You'll gain topend power, though.

(PS - this is an educated guess. Until we get some hard info, no one knows for sure how the car will react.)

 

if you want loud just get a single 4inch straight pipe, no cat, no muffler, no nothing

 

that would make sense yes..

but how who i go about making it a dual from my greddy axle back exhaust?

 

dual exhaust wouldnt reduce performance on a turbo 4banger would it? because i've seen a EVOX using the Y-config on a cat-back.

 

You cant use your greddy for a dual exhaust setup without spending a lot more money. You would have to by another greddy muffler, cut and re- weld both of them it into a functional Y setup and figure out how to mount it.... which is a lot of custom fab work for something that probubly will kill your performance and is there for more looks than anything. So wait till the ralley art comes out the get an aftermarket dual exhaust that is out for it. Most likey it will be the exact same for the 08 lancer. The should probubly just call it dual tip exhaust.

 

sounds good..thanx

i might just get a muffler untill then with my intake cause i hate this quietness in the lancer im about to order the evo X conversion kit and see how that turns out