Blah most of the Rs that I have seen in stock form dity themselfs, If I don't wsah my car at least once a week the rear bumper is nasty black.
You can put a VAFC on the car and get it tuned which will help a lot, maybe not 100% but some.

The ITRs just seem to burn oil and run rich in stock form, nothing much to worry about.

Just make sure that the car is maintained correctly and you should have min headches.