exhaust musts

[STi AdDiCt]

if i want to buy a dual exhaust system, what else do i need with it to do a complete job (ie. headers)

 

[Firebird]

What kind of car, exactly?

 

[Joey D]

Unless its a V8 motor duals won't work and assuming you have a WRX you can't get duals on a I4 motor.

 

[Pistachio]

Unless its a V8 motor duals won't work and assuming you have a WRX you can't get duals on a I4 motor.

Ummm.... i don't see the logic.

Besides a WRX isn't a I4 its a flat-4 EJ20.

 

[Takumi Fujiwara]

Duals should actually be useable on a flat-4. Headers are probably necessary.

 

[STi AdDiCt]

sorry...i have a 88 cutlass supreme. 5.0 v8

 

[Duke]

Ummm.... i don't see the logic.

Besides a WRX isn't a I4 its a flat-4 EJ20.

That's what he's saying; the WRX is a different story from a straight 4 because it's horizontally opposed.

Dual exhausts are not necessary or even helpful on a straight engine, be it 4, 6, or 8 cylinders... (yes, there have been a few). The whole purpose of duals is to provide equal breathing for both banks of cylinders. If you only have a single bank, then... you do the math. There is no benefit to be gained from putting dual exhausts on an inline engine.

And, for the record, on an inline engine it's a header, not headers.

You don't use header(s) with a turbo engine, and even though a N/A Impreza might conceivably benefit from dual exhausts, I doubt it. And the WRX would not because both banks' exhausts are collected to a single point where they pass through the turbocharger. And once you've got them at a single point, there's no reason to add the weight to split them up again just to make the trip to the back of the car.

None of that is relevant. I just wanted to clear up some of the info flying wildly around.

For a good ol' American V8, headers and duals will definitely benefit you; plus they have the added benefit of being cheap as grass. Try www.jegs.com or (brace yourself) www.jcwhitney.com . I like Jegs better since they are aimed at real performance and their prices are decent. Buy headers from them, and then you can get a set of duals bent for you at the local muffler shop, or they may have a premanufactured system for your car.

You don't need headers to install the duals on your V8. They will bolt up to the existing exhaust manifolds... but for a little more money you might as well get them and see a real performance gain.

 

[Dorifto]

sorry...i have a 88 cutlass supreme. 5.0 v8

Flowmasters. 👍

 

[STi AdDiCt]

so when i buy dual exhaust all i need with it is headers and nothing else?

 

[Victor Vance]

OK... I have to ask... what exactly is the difference between a flat (head?) four/six and inline four/six?

STi, nice ride, it's also known as the Carpice, and Fleetwood, right? My dad's got one of those. Anyway, yes, a good set of headers would help get better power than stock anyways. Of course, you could probably go to the junkyard and find a '94-'96 (any year before 94 won't work, because the '93 my dad has [it's a Roadmaster BTW] is single-exit) Caprice/Cutlass/Roadie/Fwood/Impala and get the entire system, for poco dinero

 

[STi AdDiCt]

OK... I have to ask... what exactly is the difference between a flat (head?) four/six and inline four/six?

STi, nice ride, it's also known as the Carpice, Roadmaster and Fleetwood, right? My dad's got one of those. Anyway, yes, a good set of headers would help get better power than stock anyways. Of course, you could probably go to the junkyard and find a '94-'96 Caprice/Cutlass/Roadie/Fwood and get the entire system, for poco dinero

http://auto.howstuffworks.com/engine5.htm

thank, btw

 

[Victor Vance]

OK, thx! I always thought flat meant flathead, it actually means horizontally opposed

 

[Slick6]

Summit Racing is about the same as Jegs. http://summitracing.com/ I think Summit Racing has a bit bigger selection.

 

[Joey D]

Ummm.... i don't see the logic.

Besides a WRX isn't a I4 its a flat-4 EJ20.

True duals can't be used on a I-4 it just won't work considering that you need 2 headers to make the duals work. You can run a Y-Pipe, but thats not a true dual.

Also duals would be pointless on a Flat 4 considering it wouldn't breathe much better. You could just put a bigger exhaust like a 2.5 inch.

Flowmasters.

Flowmasters sucks...badly. They are just loud and offer no real performance. After checking around Borla and Gibson seem to be the best. Or go to a muffler shop and get a custom 3 inch setup, with no muffler.


Finally it would be hard to get a full system for a car now because I think that a muffler shop will not replace a good Cat. Don't quote me on that for older cars but I was told when I was looking at exhaust for my truck that you could only get a cat-back system.

 

[Pistachio]

That's what he's saying; the WRX is a different story from a straight 4 because it's horizontally opposed.

Dual exhausts are not necessary or even helpful on a straight engine, be it 4, 6, or 8 cylinders... (yes, there have been a few). The whole purpose of duals is to provide equal breathing for both banks of cylinders. If you only have a single bank, then... you do the math. There is no benefit to be gained from putting dual exhausts on an inline engine.

"Unless its a V8 motor duals won't work and assuming you have a WRX you can't get duals on a I4 motor."

Seems to me he was referring to the WRX as a I-4, not an uncommon mistake considering almost all cars in it's class are, and all cars in WRC.

My main pick was the suggestion that dual exhausts would only work on V8's, making them (according to what he wrote) useless on say, a Porsche Turbo, which means Porsche added dual exhausts for no reason and the Turbo is a compromised car, in which case i would be deeply insulted because as you know i love the car to bits.

 

[Lethalchem]

so when i buy dual exhaust all i need with it is headers and nothing else?

No. You will already have 2 manifolds, although not necessarily the best performers, they have nothing to do with what you're asking. You will need some sort of X-pipe or H-pipe (with or without cats, depending on your tastes ), two mufflers, and a set of pipes. It can be done properly, or it can be slapped together, so the parts you will need can vary.