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Discussion Starter #1
ok....i was think of goin with dual exhaust but dont have many ideas. can anyone w/dual exhaust or anyone who knows what there doin help me out!?!?!?! i already know about the spare wheel well comin out, but want to know what brands would be the best to go with, and/or any other mods....thanks for all replies
 

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you can either use a single inlet/dual outlet muffler, such as the z28's. or you can use two separate mufflers. after a y-pipe.
 

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190km/h said:
I'm going with the dual outlet, single inlet muffler strategy... and i'm keeping the spare tire well. :)
Good plan, IMO. cutting out the tire well has always seemed like a bad idea to me..
 

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Mazda MX6 Member
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yeah, plus the y-pipe exhaust adds weight, so it kinda defeats the purpose, so the single inlet, dual outlet deal makes the most sense.
a question on a question though, do the headers join, or are they two pcs until they hit the cat? would it be feasable to run a true H pipe setup all the way back. sorry, I'm a 4cyl owner.
 

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splink48 said:

a question on a question though, do the headers join, or are they two pcs until they hit the cat? would it be feasable to run a true H pipe setup all the way back. sorry, I'm a 4cyl owner.
Headers are joined by y-pipe and join into one pipe that hits the cat. I think true dual exhaust would be good on f/i applications, other than that it might be overkill. You would have to fabricate your own pipes coming off each bank of headers. Then run 2 pipes down from the header banks into individual cats and mufflers. Connect them with a X/H pipe. I don't think most v6 will put out enough power to require this. A good single set-up should work just as well.
 

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Discussion Starter #8
i have a gt.....but i think i will go with the y-pipe and dual mufflers.... not 100% sure though, anything else i should know about????
 

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Mazda MX6 Member
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I'd ward you against the Y setup. Yeah, it looks cool, but its an overall loss. you'll be dividing the same pressure air into two mufflers when you can get by with only one. you'll have that one muffler workin harder syndrome too unless you split perfectly in the middle. plus an extra muffler means extra weight, so you'll end up in the same situation as before...either:relatively small gain, no gain, or loss of hp. plus you have to deal with backpressure issues, which, on the gt, aren't so difficult to deal with. do what you want though. it really does look cool to have dual exhaust on our cars, but it does depend on what you're going for as well: fast and furious or legitimate speed mod.

c-man: thanks for the info!
 
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Here's a question for ya: my setup will be with the dual outlet muffler aligned like the stock muffler, one outlet facing towards the front of the car and one towards the back. The back outlet will have a pipe that goes back, left, and then forward, and the muffler will be tucked up as high as possible to hide it.

ie:
____
|......|.|
|......[X]
|......[X]
|......|
^.....^


ASCII ART 0wnZ j00!!! :p


But here's the question: will the exhaust come evenly out of both pipes all the time, or just one? Or will it come out of one at idle but come out of both at WOT? Does anybody know?

BTW, I'm using a Dynomax Super Turbo muffler... i would use an ultra flow, but i'm running without a cat or resonator, just pipe after the turbo.. don't want to sound like a lawnmower, thank you very much. :)
 

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Don't worry...

It'll split evenly within the muffler - that's what single-in-dual-outs are made for. The pipe rigging that you're talking about is exactly how Scamper did his 1st gen, and his sounds fine. :)
 

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Discussion Starter #13
uhhh.......dont know what to do....i guess i'll go wit the single inlet and dual outlet. i would much rather have it for performance, then looks.....!
 

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Mazda MX6 Member
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look up the dual exhaust setup for the neon r/t
 

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I know flomaster makes one. Ravin has one. Most unviersal muffler companies (probably mostly domestic ones) should have their own brand available.
 

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Yes, but buyer beware:

Not ALL single inlet, dual outlet exhausts are made the way that you will need. for example, I have a Flowmaster single in dual out, but the dual outputs are on one end and the single inlet is on the other. For your project you need to be sure your muffler has an outlet on BOTH sides and an inlet on just one side.

HTH
 

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Refugee
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I went with two mufflers. If your worrying about the extra wieght of the second muffler and pipe, than why are you even worrying about dual exhaust... stick with single. There is no real performance gain with dual's over single (in this situation) so its completely an aesthetic mod.

The hardest part about splitting the pipe and useing two mufflers is makeing it look even. Trust me, if its not exactly even you will always notice and it will always bug you. Also, MAKE SURE the shop you use does not just cut a flap into one pipe and weld the other one on. Make sure they use a y-pipe to split it. If they do it properly the flow should be pretty even, the only time you might notice otherwise is in cold weather at idle.

Also, go with 2 1/4" pipes instead of 2.5" to keep that backpressure. I took out the resonator but kept the cat and there is no raspiness at all. Sounds great.

Hope this helps.
 

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Yeah, thats pretty good advice. I wouldn't use 2 1/2" on dual pipes. 2 1/4 sounds like a better set-up.
 
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