I was thinking the same thing when I put a pitts on my Cap. I ended up cutting two slots for the exhaust tubes. You have to look real close to see them in the air. The slots will help draw air from the cowl intakes and keep the exhaust tubes cool.
I laid a piece of thin card stock on the fuse such that it overlapped the exhaust tubes and taped it in place on the trailing edge. Cut slots in the card stock till it was parallel to the fuse. I then flipped the card stock up, took the pitts off, and mounted the cowl. I flipped the card back down, transferred the slots to the cowl via dry-erase markers, and dremelled them out-little by little.
Worked like a charm and hardly noticeable.

Someday I'll get that scanner/printer/fax machine so I can post pics!