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Mishimoto Universal Air-to-Water Intercooler

Yes that's right, a bonus part does not earn any tuning points. But you can scale the smallest intercooler so small and place it inside the Mishimoto, so you still get the performance points.

but how would you use it in the game... you have to go into the car editor and edit each one you are interested in adding, don't you?
But it doesn't bring any performance improvements or anything attached with the part, does it?

its supposed to be a Air-to-Water Intercooler like the title suggests

I have no imagination, what is its use?