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That looks like the Leo Vince slip-on, which absolutely will pop when you roll of the throttle. That's normal for that exhaust. Since it's a slip-on, there's no tuning adjustments that should've been done. You will lose maybe 1 hp with the slip-on, but it's not that noticeable. I have the carbon fiber version of it, which I run without the baffle, and I can hear all sorts of pops when I roll off to engine brake. It's also incredibly loud without the baffle, but I like it.
My bike is also lowered an inch, but again, that's not going to affect the top speed. What will affect it is your size (height & weight) along with your body position. I'm 5' 1" and if I tuck down behind the windscreen, I can easily hit 100 mph on a flat, more on a downhill. If I sit up above the windscreen, that drops significantly. For giggles I watched my 5' 10" husband hit 110 mph on it and then watched it slow down to about 85 mph when he sat up - the body acts like an air brake at that point.
I would ask the former owner when the last time it was serviced, including the valve adjustment and the spark plugs replaced. Also, pull the airbox and clean it.
My bike is also lowered an inch, but again, that's not going to affect the top speed. What will affect it is your size (height & weight) along with your body position. I'm 5' 1" and if I tuck down behind the windscreen, I can easily hit 100 mph on a flat, more on a downhill. If I sit up above the windscreen, that drops significantly. For giggles I watched my 5' 10" husband hit 110 mph on it and then watched it slow down to about 85 mph when he sat up - the body acts like an air brake at that point.
I would ask the former owner when the last time it was serviced, including the valve adjustment and the spark plugs replaced. Also, pull the airbox and clean it.
