I don't see why not. Exhaust would be Stainless and the iron-x is acid free so would be safe for aluminum too. It's safe on painted wheels so it should be quite safe for exhaust. I don't know how well it will degrease/decarbon your exhaust...but should be quite safe.

 

I normally use P21S Total to degrease initially and then use the P21S metal soap and have had tremendous results. P21S Metal Polishing Soap

 

I like those OEM wheels, especially on that color.



I wish that they would come standard on the Q40 with the OEM duckbill spoiler as the combination of the two completely changes the personality of the car.