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T25 Turbo Downpipe Flange? - Induction/Turbo/Manifold/Exhaust - The Lotus Forums - Lotus Community Partner #ForTheOwners Jump to content


T25 Turbo Downpipe Flange?

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Hey Guys,

Finally decided to have a set of test pipes installed on my car. I'm have custom pipes built so that I can easily interchange the cats with the test pipes when the car needs to be smogged. I don't want to have to cut and reweld things everytime I need to switch. So with that being said, I need to locate two downpipe flanges so that the muffler shop has something to weld to instead of the exhaust housing. I found out that there is a significant difference between the T3 downpipe flange and the T25 flange. Does anyone know if the flange is something special or will a typical 3-bolt 2.5" header flange work? Please see provided Ebay auction. I still have the exhaust on the car so I do not have the capability of comparing the flange on the car with the flange that I think will work. Any quick help would be greatly appreciated, as I'm trying to have the work done tomorrow! Best Regards.

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As far as i can see -there is an gab on one side of the original pieces with that 3bold face, just there on which the turbo does move its wastegate actuator lever along (as the turbos are not symmetrical, both pipes do have that mark -but only on one engine side it is important..)

on the other hand there should be no problem to cut/grind that out with an angle grinder after you have get the parts !?


to name the things if I see them, that's what I call integrity..


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Thanks for your response! After removing the cat's I now see what you are talking about. I was able to find the 3-bolt flange without a problem; however, it was ball/socket joint on the other end of the cat that posed a problem. Instead of having the muffler shop build a set of pipes, I ended up buying a set of direct bolt-in Larini pipes. In the long run they will be well worth the price, plus they look fantastic! Best Regards.


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