I had the "quiet series". It wasn't. Even with the minimum number of disc's it was noisy. To the point that my neighbors complained about it waking them up in the morning. There werent any performance gains that I could tell. I put the stock exhaust back on and sold the can. -Tom.
I had this pipe on a 2008 KLR I bought to ride around for a week on a trip instead of renting one. It was so loud that if I didn't have my ear plugs in just right, I couldn't stand it. Whenever I was in a town I felt I was helping to give pedestrians and people in cars a reason to dislike motorcyclists.
Had to buy a stock pipe from someone here on the forum to get the bike sold.
I will admit that with the pipe and re-jetting it had better acceleration than stock. I ride a stock 2009 now.
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