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Old 01-11-2012, 12:22 PM   #1
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Default N/A Quiet 2.5" exhaust

Just finished getting the motor rebuilt by Rebello. 208hp at the crank. I'm looking for a 2.5" free flowing exhaust that will hopefully pass Laguna Seca sound. Any ideas?
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Old 01-11-2012, 12:40 PM   #2
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2.5" 5x11x22 Magnaflow.
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Old 01-11-2012, 12:51 PM   #3
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Quote:
Originally Posted by tblackey View Post
Just finished getting the motor rebuilt by Rebello. 208hp at the crank. I'm looking for a 2.5" free flowing exhaust that will hopefully pass Laguna Seca sound. Any ideas?
Is this an NA motor or turbo?
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Old 01-11-2012, 12:55 PM   #4
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"N/A Quiet 2.5" exhaust"
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Old 01-11-2012, 12:57 PM   #5
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prebuilt or DIY? Jason's suggestion is just a muffler.

If you have the money for a 208hp N/A motor that was professionally rebuilt, I'd suggest FM's, although it's only 2.25". Or try Enthuza, they have a good selection of budget systems. Next try goodwin racing, they have a good explanation of their systems, including loudness and power. Just checked though, couldn't find it. Might be on racing beat's website.
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Old 01-11-2012, 01:00 PM   #6
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Enthuzas stainless 2.5" racer exhaust should be below the limit. I don't know anyone with that exhaust, but it should work.

http://shop.enthuzacar.com/product.s...4&categoryId=4
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Old 01-11-2012, 01:59 PM   #7
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I have had a Enthusa on my N/A 93LE since like 2001.
Very pleased with it.
It sounds great, and is not too loud.
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Old 01-11-2012, 05:17 PM   #8
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If a cat is required, how about the "RoadsterSport Midpipe with Catalytic Converter and Resonator" sold by Good-Win-Racing and GoMiata? It's 2.5" and there should be plenty of choices for both headers and mufflers to go with that.

- Tom
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Old 01-11-2012, 07:23 PM   #9
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First of all, I would not cheap out on an exhaust if you went through so much trouble to build such a well prepared N/A motor.

Start out with what your header options are, and forget about the off the shelf headers like the Racing Beat 4:1. That header is not designed for 200+ hp N/A motors. I think 949 still has a racing header, or you can contact Jesse Prather Racing. They do all out N/A Miatas, and have some insight as to what exhaust you will need.

When you get your header selected, than decide on what rear exhaust to run. Racing headers often do not have the same bolt up location and flange as off the shelf headers. 949's header may have that ability, but you will have to look into it.

I personally would build a rear exhaust that was a straight through design if you are building a race car. It will have the least restriction and lightest weight. You may not need it to exit the rear of the car, but you will have to check your rule book on that. From there, it is simply choosing the muffler that will fit, and meet decible limits.
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Old 01-12-2012, 12:45 PM   #10
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I'm using a 4-2-1 right now with the stock flange where the end of the cat would be. Eventually I might get a Stahl header, but not yet. Motor was dyno'd with that header. Xida's are next.

I'll probably just have a new one done with mandrel bends at the muffler shop, but if there was something good off the shelf that would be nice. I want it to be quiet enough to pass a 92db day at Laguna Seca though, and that's not super easy.
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Old 01-12-2012, 01:26 PM   #11
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Xidas > any exhaust.
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Old 01-12-2012, 01:41 PM   #12
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You have a local muffler shop that has a mandrel bender!?
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Old 01-12-2012, 01:42 PM   #13
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Burns stainless muffler, light and quiet but will cost you. You'll have to fab the rest.

BTW, are you the same guy that had the LS swapped FD?
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Old 01-13-2012, 12:53 AM   #14
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I ran a FM turbo exhaust (duals on mine) with a highflow magnaflow round resonator after the cat for a long time N/A and it was very nice and mellow.
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Old 01-13-2012, 09:51 AM   #15
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Quote:
Originally Posted by sbrian2 View Post

BTW, are you the same guy that had the LS swapped FD?
Yep. 1.33 at Laguna, Shooting for under 1:30 this year with bigger motor and more tire.
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Old 01-13-2012, 06:59 PM   #16
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Quote:
Originally Posted by tblackey View Post
Yep. 1.33 at Laguna, Shooting for under 1:30 this year with bigger motor and more tire.
Awesome, love the car. I co-drive Dan Chadwick's (Tweakit Racing) autocross car and him and I helped build Brent Dalton's LS1 FD. I also believe I helped a buddy of yours, Chris Coffee (sp), by letting him test fit some control arm on one of our cars.

Good luck with the Miata build, I can't wait to see how it turns out knowing how your FD is.
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