dual exhaus for a 94

i have a 94 cx, i'm planning on doing a swap. i'm not too sure what i'm going to get but i do know i want dual exhaus system oh that sucker. will that be a good thing? or a bad thing?

[slowEJ6]

well as long as you keep the pipe diameter the same....it'll add more weight and a bit of backpressure cuz you'll have 2 mufflers.
so lets say.......2.25" pipe from the cat to the Y pipe - Y pipe needs to be about 1.25" to each muffler......any bigger and you'll be losing considerable amounts of power.

[AzCivic]

but really, dual exhaust on a four cylinder?

[slowEJ6]

why not? if you dont want all out performance, looks pretty good with the right rear bumper.

hmm, i want to go all ballz man, i'm planning on all motor... so i guess dual won't be such a great idea?

[Addict]

Originally posted by yelizardking
hmm, i want to go all ballz man, i'm planning on all motor... so i guess dual won't be such a great idea?

Nope not at all. Civics never came with dual exhaust for a reason......

that's true, thanks a alot.

[94_AcCoRd_EX]

Originally posted by yelizardking
... so i guess dual won't be such a great idea?

Nope, just stick with the single exhaust for performance. The weight savings alone will help out, not to mention the whole backpressure thing.

back pressure ey. tell me a little bit more on that

On an all motor setup, backpressure is desirable because it helps maintain torque. If you run a 3" exhaust with all motor, you will lose not only HP but a lot of torque as well. Now with a turbo or supercharger you usually want as little backpressure as possible. A 3" then becomes a good idea. For your setup, stick between 2.25" and 2.5" for your exhaust for best results.

[AzCivic]

Backpressure is NOT good for any engine! The reason for the smaller diameter piping for a naturally aspirated engine is to help keep up exhaust velocity which helps evacuate the exhaust gases in the low RPM's but in the higher RPM's bigger is better cause you have enough exhaust flow to make use of the extra room, so for N/A you kinda have to make a comprimise but for turbo the bigger the better. But yeah 2 1/4- 2 1/2 is a good choice.

dual exhaust is a bad idea on a civic unless you have 2 seperate systems. if you only have 1 system with 2 mufflers you only add weight and create back pressure ( like everyone else said ) if you are looking for a quick jump in horsepower with out adding a supercharger you need to dump the dual exhaust idea and get you a header, make sure you get a 4:2:1, because the 4:2:2 cause turbulance on civics which is going to actually cause you to lose torque.

[Addict]

An exhaust system doesn't weigh all that much. But regardless, a dual exhaust will do more harm than good.

headers ey. how about 4-1?

i'm still a little confused on backpressure. i know why it is good and bad. but what is the exact definition

yeah no dual i agree on a 4 cylinder that is just not worth it

[AzCivic]

Originally posted by yelizardking
i'm still a little confused on backpressure. i know why it is good and bad. but what is the exact definition

backpressure is like piled up exhaust gases.
the more an engine has to work to expel the exhaust gases the more backpressure it has to work against.