I have inner fender liners. I have a bigger turbo now than the picture, and I cannot fit a safely sized air filter in that area. My car is well over 1200 RWHP now, so the turbo sucks a lot of air. I have my turbo mounted here:
When I run it open to suck engine air, everything gets dirty in the inlet. Even the turbo impeller.
When I box it off, so it only gets air out of the fender cut, it stays much cleaner. The ET does not change a noticeable amount.
Just be sure you do not restrict the inlet. When I add a wide mesh screen on the turbo inlet, I notice a severe reduction of boost and increase in IAT. In my car, any restriction is worse than drawing from warmer engine compartment air.
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