Just wanted to thank you KC....Just change my spark plug to Iridium....Then bolted on my new black 2 stroke exhaust (allenwrench bolts) like you recommended.. I did have to heat the pipe and bend it in a vice somewhat, but very little....fit on very easily...It was like a breath of fresh air for this little engine.......Purrs like a kitten....and no extra noise, real quite.....Couldn't be happier after following your advice.....Thank you....Rick