I purchased a used SS exhaust which was supposed to fit a 6A (originally from Aircraft Spruce). It just bumps up against the engine mount where the rear tube (2 into 1, number 3 and 4 cylinders) passes through the engine mount. The mount interference is the portion for the front landing gear. My guess is it really only fit a 6, not the A version. The fix seems pretty simple. cut the pipe, weld in an extenstion and make a small bend. Does anyone know of a source for the SS exhaust pipe? The sizes used are 1.75" OD and 1.84" OD, looks to be about .035 thick. Thanks for any help.