Exhaust pipe size - Mazda MX-6 Forum
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post #1 of 37 (permalink) Old 3-21-12, 23:52 Thread Starter
 
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Exhaust pipe size

What are you guys runnin with? Does anyone know what diameter the OEM size is (MX6 GT)? Are the OEM mufflers restrictive? I have a Magnaflow cat, ready to install.

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post #2 of 37 (permalink) Old 3-22-12, 1:20
 
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I run a 3" turbo back, catco cat, and a magnaflow muffler at the end
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post #3 of 37 (permalink) Old 3-22-12, 10:10 Thread Starter
 
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Matt, what do you think your HP numbers are? Have you noticed any difference in low-end torque?

Thanks.

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post #4 of 37 (permalink) Old 3-22-12, 10:45
 
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If you're sticking with stock turbo, go 2.5" all the way back, downpipe included. It'll give you a nice little kick and should increase torque.

“One thing I’ve noticed over the years is that if you drive into London at 6am, half of the cars on the roads are Porsches and Astons. Whereas if you go in at ten to nine, they’re all Renaults. Simple solution, then. You want a nice car? Get up earlier and do more work.”

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post #5 of 37 (permalink) Old 3-22-12, 11:17
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How about mpg difference??
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post #6 of 37 (permalink) Old 3-22-12, 14:11

 
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Quote:
Originally Posted by concealer404 View Post
If you're sticking with stock turbo, go 2.5" all the way back, downpipe included. It'll give you a nice little kick and should increase torque.
I would stick with 2.5" straight-through unless you're going with a holset sized turbo. The 2.5 will flow enough that it won't cause any restrictions until you start reaching upwards of 300whp

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Originally Posted by klzefreak View Post
How about mpg difference??
it will drop considerably...since you'll be boosting more and won't be able to keep your foot out of it

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post #7 of 37 (permalink) Old 3-22-12, 15:18 Thread Starter
 
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Thanks, everyone. I believe my boost is up around 12 psi and they say that every 1 psi increase gets you 10 HP but I haven't dynoed the car yet. Still, I can't help but think that my 160,000 mile cat is not fully open and most definitely, the OEM exhaust was not sized for over 200 HP.

What is the OEM pipe diameter - 2" or 2 1/4"?

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post #8 of 37 (permalink) Old 3-22-12, 16:29
 
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I think it was 2" OD... but not positive.

“One thing I’ve noticed over the years is that if you drive into London at 6am, half of the cars on the roads are Porsches and Astons. Whereas if you go in at ten to nine, they’re all Renaults. Simple solution, then. You want a nice car? Get up earlier and do more work.”

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post #9 of 37 (permalink) Old 3-22-12, 17:06
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When I upgraded to 3" turbo back, no cat, I noticed a huge difference. Not night and day but definitely noticeable. Hit boost faster, harder, and it started to creep too. I actually had to turn the boost down.
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post #10 of 37 (permalink) Old 3-22-12, 20:34 Thread Starter
 
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Thanks, Concealer.

Dub,
That's what I'm hoping for - thanks.

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post #11 of 37 (permalink) Old 3-23-12, 3:45

 
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I though the stock size was 1 7/8"

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post #12 of 37 (permalink) Old 3-23-12, 6:48
 
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^ +1 to that.

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post #13 of 37 (permalink) Old 3-23-12, 9:40
 
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Quote:
Originally Posted by chief tool View Post
I though the stock size was 1 7/8"
ID, that sounds right.

“One thing I’ve noticed over the years is that if you drive into London at 6am, half of the cars on the roads are Porsches and Astons. Whereas if you go in at ten to nine, they’re all Renaults. Simple solution, then. You want a nice car? Get up earlier and do more work.”

— Jeremy Clarkson
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post #14 of 37 (permalink) Old 3-24-12, 0:24
 
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I like the tone of the 3" over 2.5 but I do have a bit bigger of a turbo than stock...

mx6 gt :: holycowad113.mp4 video by matt89glturbo - Photobucket

not the best vid, but it's the only one of the full exhaust...

this one is removed at the cat, but a 3" dp and my sweet header

VIDEO0006.mp4 video by matt89glturbo - Photobucket

and the shitty phone mic, haha now that I listen to it at volume...
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post #15 of 37 (permalink) Old 3-24-12, 1:18 Thread Starter
 
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The first one sounds good but the second does sound like a spaceship to me.
...and where's the boost gauge?

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