Yeah, but typically people don't do it when the filter element would be 1" from the exhaust manifold. I get the idea, on a previous car I turbo'd, I put a filter right on the turbo. No pipe, nothing, just 4" inlet filter clamped directly to turbo. But I had room and it was a top mount turbo. I don't see how it could be a good idea to put a filter that close to the manifold. On another car I turbo'd, we initially had the filter right next to the manifold. But when things got hot, car lost power. Air was so hot even with intercooler that the car was pulling timing. We added a pipe to move the filter from next to the manifold and everything was fine.
I'm curious, how would you even get a filter on the rear turbo?
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