Jbusch said:
Any feedback on the yoshimura rs4?
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I put a Yoshi RS 4 and then got Anthony's flash done on my 2012 just last month. All I can say is I should have done this a long time ago. I debated about the muffler for months, I mean almost a whole freaking year. I can say that it was worth the little extra grunt or sound that it puts out. When it comes to the power it felt as if I gained a bit of low end torque. I've been told that about every aftermarket muffler will yield about 5hp somewhere in the powerband.
Want to hear the grunt, get on it... want to be quiet, just get of the throttle a bit. I also did the throttle body adjustment at the same time as the muffler, so I can't say that it was the muffler or the throttle body adj, but it seemed smoother off the start right away. The only issue with the Yoshi is I find myself getting into it.
Then came the flash from Anthony. Holy cow!!! I'm so happy that I found a thread here about this. I had no idea what I was missing out on. I bike feels so free now. After riding the flash from another inmate here on the forums and being able to ride my bike and his back to back, it felt like my stock bike had an anchor behind it. Cruising down the highway at 80mph it feels smooth and happy now.
If I only had the money to do one of the options above it would definitely be the flash.