What downpipe flange is this?
#4
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Looks kind of like the old cosworth t3 output flanges.
![](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/33643-what-downpipe-flange-atp-hsg-075_450-1.jpg?dateline=1328648685)
Design is arguably better than a 'standard' t25 as the wastegate outlet angle is better. You'll essentially use a 3 bolt 'floating' flange that will sit over the end of a swaged out 'socket' type joint on the downpipe inlet. Bolting it down will compress it for a leak free seal without a gasket. You can get the 'socket' from mandrel-bends.com. Check their 'socket joint' section. You could probably also get away with a transition cone, but I'm not positive.
![](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/33643-what-downpipe-flange-atp-hsg-075_450-1.jpg?dateline=1328648685)
Design is arguably better than a 'standard' t25 as the wastegate outlet angle is better. You'll essentially use a 3 bolt 'floating' flange that will sit over the end of a swaged out 'socket' type joint on the downpipe inlet. Bolting it down will compress it for a leak free seal without a gasket. You can get the 'socket' from mandrel-bends.com. Check their 'socket joint' section. You could probably also get away with a transition cone, but I'm not positive.
#13
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The first 2 pictures you took were with the manifold off the car correct? Hence why I said it is not attached to a miata. If it was bolted on you could not get that picture of the rear flange. No room to get a camera between firewall and turbo and get a perfect picture.
#14
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Oh i see. Then I misunderstood you ![Giggle](https://www.miataturbo.net/images/smilies/gay.gif)
No it is not fitted yet because I just bought it 1 week ago, thats why I signed for this forum to get some good advice, tips and tricks. This is my first turbo build, so its great with a forum like this, have already learned a lot just by reading around the different threads.
![Giggle](https://www.miataturbo.net/images/smilies/gay.gif)
No it is not fitted yet because I just bought it 1 week ago, thats why I signed for this forum to get some good advice, tips and tricks. This is my first turbo build, so its great with a forum like this, have already learned a lot just by reading around the different threads.
![ugh](https://www.miataturbo.net/images/smilies/ugh2.gif)
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