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Old 10-25-2012, 07:46 PM   #21
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I would recommend 2.5" or bigger.
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Old 10-25-2012, 07:53 PM   #22
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Quote:
Originally Posted by andy13 View Post
what size of exhaust would yous recomend?
I have had a look at lots of T25G and either my computer is being usless or I am ( probably me) but what flange is on manifold I have seen 2 types, a circular one with 2 bolts and a square one with 4 bolts?
Everyone will tell you to run a 3" exhaust and a big *** Magnaflow muffler, but 2.5" seems to get the job done for an awful lot of people. The key is mandrel bends and smooth transitions.

Standard T25/T28 Turbine inlet:




Standard T25/T28 Turbine outlet:




I can't say I've ever seen a "circular one with 2 bolts" but if you are seeing T25s with a 4 bolt compressor inlet and a round hole, it may be a TD05 from a DSM. Check out Joe's thread: https://www.miataturbo.net/useful-sa...flanges-52542/ for more details
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Last edited by EO2K; 10-25-2012 at 08:06 PM.
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Old 10-26-2012, 12:01 AM   #23
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Quote:
Originally Posted by andy13 View Post
what size of exhaust would yous recomend?
I have had a look at lots of T25G and either my computer is being usless or I am ( probably me) but what flange is on manifold I have seen 2 types, a circular one with 2 bolts and a square one with 4 bolts?
I did a full 2.5" on the last build I did before I sold the car and had great results. The typical T25 flange has 5 bolts. The 300zx T25 turbos used a 4 bolt flange. Go with the 5 bolt.
300zx t25 turbo:
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Old 10-26-2012, 12:27 PM   #24
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GT2554 is the stock turbocharger used on 2003 and 2003.5 Mazdaspeed Proteges. Check out Mazdas247.com, in the classifieds section.

Oh, and I'm new here so, Hi...
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Old 10-26-2012, 02:12 PM   #25
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Three inch downpipe and exhaust with bigass Magnaflow muffler as stated above. Three inch will be more efficient and will give you headroom if you decide to upgrade later. It will work with a 2.5 but will work better with a 3.
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