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Old 07-15-2013, 05:26 PM   #1
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Default Custom 3" exhaust or pre-built one. Help needed please

So I've purchased a Turbo'd 1.8 miata and the previous owner literally did everything perfect except for the exhaust, right now it's an angled downpipe (sharp 90 degree turn) and flex pipe 2.75 inches for the rest.

I've been looking to get a custom 3" down pipe, high flow cat, and magnaflow muffler in order to increase flow, get a little more power, and stop heat from rising back into the turbo.

Any suggestions on exhausts if I should build my own or pre-purchase one? I'm in Kirkland, wa so are there any local shops that people recommend?



Specs on the miata:

Garrett T3 60 turbo from ATP Turbo
M-Tuned Shorty turbo manifold
Track Dog Racing intercooler system with "over the top" pipes
AEM standalone ECU with 91 and 94 octane maps, 17+ psi
FM level 2 clutch
M-Tuned coolant reroute
AEM 3.5 bar MAP sensor
AEM wideband O2 sensor and gauge
Saturn knock sensor
GM boost controller
RX7 550 cc drop in fuel injectors
PWR aluminum radiator
boost gauge
Hydraulic hood lifts
Shock tower brace
Custom exhaust
Stage 8 fasteners between turbo and manifold
Walbro high flow fuel pump

Boss Frog Clearview roll bar
Duetto Glass window top
Moss Motors black seat covers
Sony stereo head unit with usb/iphone interface
1000 watt amp in trunk
headrest speakers
custom subwoofer box for rear deck with 8" square Kicker sub

Ground Control coilovers with Eibach springs, 425/300 rates
KYB 8-way adjustable shocks
Flyin Miata rear shock mounts
Carbotech brake pads
Flyin Miata sway bars
14" semi hollow spoke stock rims painted to match brake dust with nitto nt01 tires for track
and 17x8 Rota grid v's for daily
Nitto NT01 205/55 ZR14 with decent tread left
Touge Run front spoiler
Side splitters


use to be red, now dipped satin pearl white





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Old 07-15-2013, 05:35 PM   #2
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How much are you looking to spend, and how much time do you have? It's a bit of a wait but I recently ordered Artech mani/DP/exhaust and the quality is perfect! The 3" exhaust was $500 +Shipping













Attached Thumbnails
Custom 3" exhaust or pre-built one. Help needed please-20130711_114130_zpsde452003.jpg   Custom 3" exhaust or pre-built one. Help needed please-20130705_185645_zps447d5a43.jpg   Custom 3" exhaust or pre-built one. Help needed please-20130705_185559_zps911ce2cc.jpg   Custom 3" exhaust or pre-built one. Help needed please-20130705_185525_zps698b6fba.jpg   Custom 3" exhaust or pre-built one. Help needed please-20130705_185505_zpsa49f666f.jpg  

Custom 3" exhaust or pre-built one. Help needed please-20130705_185446_zps2f4814f3.jpg   Custom 3" exhaust or pre-built one. Help needed please-20130705_185425_zps1aaa0293.jpg  
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Old 07-15-2013, 05:44 PM   #3
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That's not bad, I was looking at FM but theirs is $1000+ and then contacted a few exhaust shops and they all wanted 700-800 for theirs. How long was your wait?

Also would it fit right up to a T3 turbo? I'm using the M-Tuned Shorty turbo manifold so I'm concerned about fitment....
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Old 07-15-2013, 05:47 PM   #4
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For my entire set-up I waited like 2 months I believe?? It might be shorter for just an exhaust. You could E-mail Abe and see what he says [email protected]
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Old 07-15-2013, 07:04 PM   #5
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If you're not building it yourself, $1k is the going price for a turbo-back 3" stainless exhaust.
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Old 07-15-2013, 09:46 PM   #6
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My Enthuza 3" stainless was mid 4'ish I believe.
ARtech 3" downpipe and 3" midpipe were another 5'ish.
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Old 07-15-2013, 11:54 PM   #7
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Quote:
Originally Posted by das stig View Post
That's not bad, I was looking at FM but theirs is $1000+ and then contacted a few exhaust shops and they all wanted 700-800 for theirs. How long was your wait?

Also would it fit right up to a T3 turbo? I'm using the M-Tuned Shorty turbo manifold so I'm concerned about fitment....
3" turbo back from Abe is a bit over $1000. BTMiata might have got it for $500 because he had at least that much in the rest of his setup.

If Abe doesn't have your manifold/turbo combination, you are going to have to take your manifold and turbo off your car and ship it to him.
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Old 07-16-2013, 07:23 AM   #8
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Somehow I missed that he also needed a downpipe. I thought he was just looking for the exhaust. In that case, yeah its gonna be around $1000 for the downpipe and exhaust.
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Old 07-16-2013, 12:11 PM   #9
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Well **** guys.... I THOUGH I found the boost leak ( the gasket between the manifold and the turbo) but when i took the heat wrap off to fix it i found this...... F My life....


Should I just re-weld it or buy a whole new set up (manifold, down pipe, full 3" exhaust)?

Unfortunately the company that made these no longer makes manifolds...







Attached Thumbnails
Custom 3" exhaust or pre-built one. Help needed please-20130715_181025_zps04232dad.jpg   Custom 3" exhaust or pre-built one. Help needed please-20130715_190510_zps0767a2c3.jpg   Custom 3" exhaust or pre-built one. Help needed please-20130715_190506_zps5d2c5e8b.jpg   Custom 3" exhaust or pre-built one. Help needed please-20130715_190530_zps3ea325dc.jpg  
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Old 07-16-2013, 12:17 PM   #10
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why is your drain your feed?
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Old 07-16-2013, 12:30 PM   #11
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Quote:
Originally Posted by rigidbigelsworth View Post
why is your drain your feed?
I'll be honest I do not know much about what was done besides what he told me. I was given two 4" thick binders of receipts, correspondents with FM, 949, trackmiata, and a few other companies, along with a short novel on what was done to the car. Also has some track notes too since he tracked it a lot over the 13 years he had the car (guy in his 50's) I've tried to make sense of it a few times but a lot of it went over my head since he's an engineer and wrote mostly in engineering language.

I'm great with aesthetics, paint, body, installs, interior, sound systems, and installing MOST parts on the engine/tranny as long as there is a DIY somewhere but most of the hardcore engine tuning and knowledge about engines is a little over my pay grade. Thus asking this forum for help
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Old 07-16-2013, 12:43 PM   #12
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I would just re-weld the manifold as a temporary solution until you have the cash for a new mani and DP.
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Old 07-16-2013, 12:48 PM   #13
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I would just re-weld the manifold as a temporary solution until you have the cash for a new mani and DP.
That's what I'm thinking. I have the cash right now BUT the manifold was an M-tuned manifold and they stopped making them last year. It also places the turbo in a unique place so i'd have to get a new exhaust welded up :/ then once i do that ill have to reroute my "over the top" intercooler piping too costing me more. Why did I choose cars to be my hobby? hahaha
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Old 07-16-2013, 02:53 PM   #14
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get it rewelded, don't wrap it so it happens again. Have a crane made for good measure.


why do we think his "feed is his drain"?
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Old 07-16-2013, 03:07 PM   #15
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Definitely not wrapping it again. I assume a crane is a support for the turbo to hold it in place? I've only seen one before do people make supports often?
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Old 07-16-2013, 03:08 PM   #16
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That feed location just looks like a mating face for a drain flange fitting to me that was tapped for a fitting.
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Old 07-16-2013, 03:12 PM   #17
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Quote:
Originally Posted by rigidbigelsworth View Post
That feed location just looks like a mating face for a drain flange fitting to me that was tapped for a fitting.
most drains aren't 1/4".

that's just what a T3 feed looks like:



Drain is big and square:

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Old 07-16-2013, 03:12 PM   #18
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Quote:
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Definitely not wrapping it again. I assume a crane is a support for the turbo to hold it in place?
reduce vibrations mostly. triangulate.
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Old 07-16-2013, 04:48 PM   #19
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Gotcha. Ive only dealt with T2 turbos.
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Old 07-17-2013, 02:37 PM   #20
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Regarding the OP's question -- considering turning to TurboTim and his "AbsurdFlow" design. His custom 3" turboback systems (and turbo manis) are incredible. I have the former; it performs and sounds great.
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