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Old 01-21-2013, 11:21 PM   #1
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Default Mazdaspeed miata exhaust question

what do you guys think about installing a 3 inch cut out right after the turbo?, do you think it will do any damage to the engine driving around like that? any hp gains?
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Old 01-21-2013, 11:22 PM   #2
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route it into the interior for full effect
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Old 01-21-2013, 11:25 PM   #3
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right under the driver seat i suppose?
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Old 01-21-2013, 11:29 PM   #4
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preferably.

so it fries off your nuts and you don't procreate
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Old 01-21-2013, 11:32 PM   #5
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lmaoo no but really what do you think
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Old 01-22-2013, 12:02 AM   #6
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lmaoo no but really what do you think
Right under the seat. So it fries off your nuts and you don't procreate.
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Old 01-22-2013, 01:53 AM   #7
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If you can't tell, these guys think your idea is stupid.

To shine some light on the subject. If you do this with an unmodified wastegate on your stock IHI turbo, you will have uncontrollable boost creep and will probably break something from going way lean. That is also assuming you do not have any fuel/computer mods.

Yes you will make more hp.

Update your signature with what car you have and what you've got done to it.
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Old 01-22-2013, 02:53 AM   #8
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The stock churbo is too tiny for 3". 2.5" is your friend.
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Old 01-22-2013, 10:13 AM   #9
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I think this mod would be best if you route it right under the seat, so it fries off your nuts and you don't procreate.
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Old 01-22-2013, 11:06 AM   #10
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All MT is just haters man don't let the haters stop you from doing your dream bro
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Old 01-22-2013, 11:32 AM   #11
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Old 01-22-2013, 02:00 PM   #12
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2004 mazdaspeed miata by the way, completely stock. what would I have to with the wastegate?
also I had in mind just a 3 inch straight pipe from the turbo back.
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Old 01-22-2013, 02:06 PM   #13
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I hope you don't street this car because that is gonna be so ******* loud when you route it right under the seat, so it fries off your nuts and you don't procreate.

Last edited by Braineack; 01-22-2013 at 02:40 PM.
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Old 01-22-2013, 02:19 PM   #14
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Originally Posted by daniel912010 View Post
2004 mazdaspeed miata by the way, completely stock. what would I have to with the wastegate?
also I had in mind just a 3 inch straight pipe from the turbo back.
Have fun finding someone who can make the bends on 3" pipe to go right under the seat, so it fries off your nuts and you don't procreate.

All your going to get is boost creep by doing this. Our turbo's have internally gated wastegates that when you add better flowing exhaust, they basically give you a big middle finger and boost creeps in higher rpms. This is bad, in case you didn't know. Since, the stock injectors in an msm really only flow up to 10psi. And that's really pushing it for that matter since the oem tune runs lean as heck in the first place.

I suggest you buy a flyin miata downpipe at least. I have a FM dp and a 2.5" pipe out the back and the car is LOUD. I ended up adding in a resonator to keep piece of mind. In any weather colder then 60 degrees I creep from 10psi to 12-13. Which if I were still running stock injectors would mean POP! Goes the weasel.

Last edited by Braineack; 01-22-2013 at 02:41 PM.
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Old 01-22-2013, 03:48 PM   #15
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Have fun getting that exhaust dumping right under your seat so it fries off your nuts so you can't procreate. I've noticed on more than one MSM, that a wide-open exhaust (Much like your anus) will result in resonance that will surely make your manifold-to-head nuts back off. The 3" is pointless. Get a 2.5" DP and mid-pipe. Use the stock muffler (by the time exhaust gases reach this far back, they've cooled down and contracted in size and will fit through the stock muffler just fine. You'll have a nice quite but "sporty" exhaust note that won't call the police. I did this to my friends MSM and there was no noticeable decrease in performance from the 2.5" tail section to the stock muffler....but now the car doesn't vibrate her ears to death nor do the damn manifold nuts come loose.

Last edited by shuiend; 01-22-2013 at 05:04 PM.
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Old 01-22-2013, 04:26 PM   #16
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amazing how a simple question can lead to burnt nuts and not being able to procreate. so no 3 inch exhaus cutoutt im guessing and no 3 inch turbo back exhaust (I can custom fabricate one). so 2.5 exhaust from the turbo back??? I dont really mind the loud and obnoxious noise, wake up the cows and neighbors. I just want the most hp without blowing a few rods lol
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Old 01-22-2013, 04:30 PM   #17
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READ BETWEEN

it's pointless for power, it will cause boost control issues that it will blow rods, it was cause vibration that will make nuts back off; stop being dumb or join clubroadster.

THE LINES
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Old 01-22-2013, 04:33 PM   #18
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I actually ran a 3inch exhaust on my MSM with stock injectors and ecu for about 8 months and no problems here. I know others have had problems and I know for a fact it is not the most ideal setup and it runs lean in areas but it can be done. I just changed to a MS2 with larger injectors and run 13psi with no problems either. My wastegate would creep to 11psi on just wastegate pressure (before I installed the MS2 I had an MBC and the stock boost cut at 10psi in place to keep safe) but now that it is controlled by ebc I have zero problems and steady boost to redline. I would just advise against a straight pipe. I run a resonator and a huge magnoflow muffler to avoid sounding like I am racing at 4000 rpms.
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Old 01-22-2013, 04:36 PM   #19
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Im new to this, don't know much about the Mazda speed engine so I'm just trying to see what options I have geez..
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Old 01-22-2013, 04:36 PM   #20
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My Engrish not so good.
CAn you pliz halp?

I read this:

Quote:
Originally Posted by Braineack View Post
READ BETWEEN

it's pointless for power, it will cause boost control issues that it will blow rods, it was cause vibration that will make nuts back off; stop being dumb or join clubroadster.

THE LINES
But the translator shows me dis:

Quote:
Originally Posted by 18psi View Post
route it into the interior for full effect
Quote:
Originally Posted by daniel912010 View Post
right under the driver seat i suppose?
Quote:
Originally Posted by 18psi View Post
preferably.

so it fries off your nuts and you don't procreate
Is this the correct answer?
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