I have installed a DA50 with a Slimline pitts muffler in my new 28% Extra Special. I have trimmed the cowl to fit without the muffler and I am now trying to decide how to trim it with the muffler installed. My question is, can the cowl be trimmed and installed without cutting it completely through the lower trailing edge ? If so, how much cowl remains between the cutout and the lower trailing edge ?