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Maybe I am wrong but I believe that a muffler smooths out the exhaust pulse a little as my flapper valve did not flutter before the muffler. I am also running a 4" stack and wonder if the larger pipe slows down the pulse a little also due to larger size pipe with the same amount of exhaust gas...

JTugwell, are you running a muffler and stock sized pipe or stock no muffler?

Mine is from tractor supply also, I made sure my idle is around 850 rpm and added a 1/2" 1/4-20 bolt with two small washers and a nut in the rear hole on the flapper and it stopped bouncing around.

I am hoping to add an EGT real soon. As soon as I do I will post the results here.

The antenna mount is 18" of 2" pvc with a clean out adapter glued on and a threaded clean out plug drilled center for the antenna base to mount to. If you need me to I will get part numbers and pics for you. It is a bit of a pain in the rear to get 2" to fit as it has an o.d. of 2.375" but it...

It was unusually easy, most of the time Murphy shows up but not this time. I used a heavy truck muffler from a local parts store it is 3.5" in and out. I cut the top off and welded on a 4" piece of stainless for a stack. The clamps are from napa and the hold down bracket is welded from two...

I put on a new muffler so I can enjoy the ride with the wife or daughter. Now my three year old will ride with me and not cover her ears.