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Author Topic: Which exhaust is better...
Nick Buchanan Verified Driver
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Currently have a Spin Tech muffler on the car (at least I think, it is a rectangular box welded up like the spintech), and can either redo the pipe with re-using this muffler, or go to the MagnaFlow 11226 with an Allied A24.

Which is better? I'm guessing the MagnaFlow, since I can't seem to find much here about the spin tech.

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http://www.trackspeedengineering.com

Lowery
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Region: Rocky Mountain
Year : 1992
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Springfield Dyno is the way to go. If you don't mind the noise.

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part by part, dollar by dollar...almost there.
Chris Lowery

Jfornachon Verified Driver
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Region: socal
Year : 1991
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It all depends on where you are at and how you are going to get the car to the track. I don't mind the sd exhaust but I know that everyone in my neiborhood would prefer if I did not have it on. Thankfully it is a track only car and I don't dive it on the track. Some tracks will not allow you to run over a certain decible like Leguna Seca. That beeing said I like my sd exhaist adn have been told by many that it is the best exhaust to haev at this time till someone make one better.

Have a great day,
Jared

Nick Buchanan Verified Driver
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I have also heard great things about the SD exhaust, but run Laguna Seca and as far as I know, it is way past the Laguna requirements of 92 (or 90, I forget) dB from 50ft.

That's why I gave my two options. I have been told that the SpinTech passed Laguna sound with a 90 coming off the end, and have read that the MagnaFlow 11226 will pass as well.
If it makes an appreciable difference, I will have 2 exhausts. One for Laguna, and one for everywhere else. I do not drive the car on the street, so that's not really a concern. I just need power; I found that I'm getting the run on some people out of a corner and then about 1/2 of the way down the straight they are pulling on me.

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http://www.trackspeedengineering.com

-Bob-
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I don't know where you guys are gettng your bash-test information on SD exhaust but I've been watching the sound number on 5 cars over the past year w/SD exhaust and the number2 are generally 82-87db.

Individual results of course may vary with the car which is not often the fault of an SD exhaust

volante Verified Driver
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Region: Mid-Div
Car #: 43
Year : 1995
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Depending on the time of the year the SD exhaust will be 90 to 95 in the midwest.More humid=95,less humid =90

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volante

Keith in WA Verified Driver Made Donation to Website
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Region: NWR / Oregon
Car #: 88
Year : 95
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What was that you said?!?! The infield wino is proud?!?! I'm having trouble hearing you with all the ringing noise in my ears from the SD exhaust I installed! [Big Grin]

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Keith Novak
(Will work for tires)

DionJ Verified Driver
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Region: SF
Car #: 68
Year : 91
Posts: 186
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We who run Laguna Seca have decided we don't like the Allied muffler, the packing melts and plugs it up...use the SD sized Magnaflow in its place and you should make sound...Don't know about the Spin Tech.

Sean Allen Verified Driver Made Donation to Website
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Nick,

What I did last year since I wasn't very performance minded is just run the stock exhaust for Laguna Seca. Sure, it probably robbed a horsepower or two, but I had a stock motor so it was no big deal.

I have the older Mazdaspeed exhaust right now, but it has a huge muffler on it. I may cut that muffler off and weld a straight through Magnaflow design onto it similar to what the SD exhaust has. This may open it up a bit (lower some weight too) and give a Hp back or so.

Something like this, either 14" or 18" case length: http://store.summitracing.com/partdetail.asp?autofilter...94784141+115&autoview=sku

Viet-Tam Luu
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Region: San Francisco Region
Car #: 14
Year : 1999
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I had an extra Laguna exhaust section made to bolt on to the end of my SD exhaust. Used this Magnaflow muffler. You can see straight through the muffler, but nevertheless it took the sound (as measured at Laguna Seca) from ~93 dbA to ~87 dbA. Pretty amazing.

I dyno'ed the car with and without the extra muffler section, and the car actually measured a bit higher with the muffler--probably measurement noise, nevertheless it convinced me there was no reason to unbolt it. Less ballast in the passenger footwell, better sound (no more obnoxious "blat-blat"), works for me...

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Viet-Tam Luu (a.k.a. "Tam")
SFR-SCCA #14 ITS
Director, SCCA San Francisco Region

Greg Garneau
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Region: SF
Car #: 99
Year : 1995
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So I see that the Magnaflow you use is a 4" race muffler, are you/do we have to reduce it back down to 2.25 afterwards or can we just let it end at the muffler?

CarbotechDanny Made Donation to Website
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Region: NeOhio
Car #: 26, 27 or 29
Year : 2001
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You can't beat the Springfield Dyno system. Give them a call and they will take great care of you. If you need to reduce the noise, I'm sure they can help you figure that out.

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Danny Puskar (push-car)
Carbotech Performance Brakes
4031 Dearborn Place N.W.
Concord, NC 28027
877-899-5024
danny@ctbrakes.com
http://www.ctbrakes.com

Puskar Motorsports
Spec Miata specialists
Chesterland, OH
216-406-8140

Keith in WA Verified Driver Made Donation to Website
Pack Fodder

Region: NWR / Oregon
Car #: 88
Year : 95
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There are a number of exhaust silencers on the market that will bolt on.

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Keith Novak
(Will work for tires)

38BFAST Verified Driver
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Region: Waterford Hills
Car #: 38
Year : 96
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I am partial to the Alara Exhaust. Very well made, good sound, passes sould at chalanged tracks and makes very good power. Its not cheap.

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Ralph Provitz
#38
2008 WHRRI SM Champion
2008 WHRRI Top 10 Overall
V2 Motorsports, Race support, Data Dude

   

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