I have a new exhaust flex tube and muffler from Bobcat. Also a clamp for connecting the tube to the muffler. The muffler is pretty straightforward. I've had it out before. Anyone with any tips about how to go about swapping out the flex tube. The old tube had some cracks in it and it is sooting up the engine. Anyone with any tips about cleaning out the engine after I get the new tube and muffler in and verify no leaks. Thanks Allen