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Discussion Starter · #1 ·
I believe a long time ago i saw a thread where the exhaust manifold and turbo flange was dremeled/grinded to the rectangle shape of the t25 flange instead of the small circle. Has anyone tried grinding the manifold and turbo to the rectangular shape that is outlined? is this worth doing while my turbo is off?
 

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Discussion Starter · #5 ·
Yeah I was just talking about port matching the two. What tools did you guys you? What estimated hp gain can i get? And does anyone have pics?
Thanks for the info so far.
 

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Take the gasket, lay it on the exhaust manifold and mark the outline. The best are carbide bits which can be used with a drill and I think you can get them for dremels as well. Makes easy work of it, but I have no numbers as most do this when they swap turbo's.
 

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Take the gasket, lay it on the exhaust manifold and mark the outline. The best are carbide bits which can be used with a drill and I think you can get them for dremels as well. Makes easy work of it, but I have no numbers as most do this when they swap turbo's.
You don't wanna do this since the gasket uses the oval shape found only on the 6cm housing of the TD04. The t25/TD04 5cm housings use a smaller circle opening.
 
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