Anyone have advice on how to keep my exhaust from burning the cowling (see pics) . Also, should I change the trailing edge of the cowling ? I am planning on installing a ram air intake (Vans) and making a boat tail style lower cowling and also replacing the prop with a Silver bullet. Currently I get 2350 rpm on the ground and 2900 rpm @4°C , 6500 msl . Any ideas/ criticism welcomed. Thanks