cheep n.: A faint, shrill sound like that of a young bird; a chirp.
I recommend making flanges at the ends of your cats, then attaching a pair of those whistle tips so it can go WOOO WOOOOO!!!!
haha just kidding, I can be such an a$$h*le right? haha
anyway, I think welding cats into a summit pipe or something of the like is your best bet...cats are really expensive, so they drive the price of catted mid-pipes waaay up.