Turbo manifold and downpipe
#1
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I bought this manifold and down pipe from ebay which looks like it has a take off for an external wastegate now should I fit one? The turbo iv decided to go for is a t25 from a 200sx which has an internal wastegate
Mazda Miata MX5 Eunos 1.6L T3 Cast Iron Turbo Exhaust Manifold w/ Steel Downpipe | eBay
Mazda Miata MX5 Eunos 1.6L T3 Cast Iron Turbo Exhaust Manifold w/ Steel Downpipe | eBay
#9
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That's... worse.
The manifold is fine. Buy a T3/T4 off of ebay and sell the downpipe for scrap because it is thin and will fail. Then buy an outlet flange to fit the T3/T4 and have the local muffler shop fab a downpipe to fit everything for $150 and be done with it.
See DVCN's build thread for success stories with a $150 Chinese T3/T4.
Do not use adapters on the turbine inlet side. They will:
1. Fail
2. Cause the turbo to hit the hood
3. Cause the downpipe not to fit the car anyway
The manifold is fine. Buy a T3/T4 off of ebay and sell the downpipe for scrap because it is thin and will fail. Then buy an outlet flange to fit the T3/T4 and have the local muffler shop fab a downpipe to fit everything for $150 and be done with it.
See DVCN's build thread for success stories with a $150 Chinese T3/T4.
Do not use adapters on the turbine inlet side. They will:
1. Fail
2. Cause the turbo to hit the hood
3. Cause the downpipe not to fit the car anyway
#15
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Thought I would chime in here since I've had experience with that manifold and downpipe. The manifold was great, didn't crack. And the downpipe also worked...with some modification. For the 6000 miles or so it was on the car it did not crack or break, the wastegate held 15 psi all day which is the spring I had in the wastegate, however it didn't fit worth a ****. It hit the firewall, a few minutes with a blow torch and hammer fixed that but it also did not fit up to the stock exhaust which was ok with me since the next day I had a new exhaust fabbed up anyways.
Long story short, yes it will work with some modification. I would not buy it again. With an adapter plate for the T25 forget about it
![](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/121076-turbo-manifold-downpipe-9fcad3c9-b7fc-4126-909b-eeb52c1b393b.jpg?dateline=1408561773)
Long story short, yes it will work with some modification. I would not buy it again. With an adapter plate for the T25 forget about it
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![](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/121076-turbo-manifold-downpipe-9fcad3c9-b7fc-4126-909b-eeb52c1b393b.jpg?dateline=1408561773)
![](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/121077-turbo-manifold-downpipe-1f640da5-441a-4fbe-b729-64e0d826576d.jpg?dateline=1408561773)
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