So this past weekend I finished up my turbo swap on my lmm. Went to a s369sxe with a wehrli install kit. In the kit it comes with a 3 inch downpipe and I connected that up to a 4 inch straight pipes mbrp exhaust to a 6 inch tip. Well it sounds like shit, super raspy at 2600-2800 rpms. What are people running for exhaust to make it not sound like shit? Should I put a muffler in it? Would going to 5 inch fix it?