I originally had my bike set up with a sert, se air filter and 07 se slip ons. The bike was dyno'd at 70 hp and 80 tq. I have had no problems and the bike performed very nice. Because I was disapointed in the sound of the SE slip ons I changed to Rush 2.00 slip ons. I love the sound and it does not appear that I lost any power. Since the rush slip ons breath so much better should I have to bike returned as a precaution? My bike was originally dyno'd in August 91 degrees. If I dyno it it 30 degree weather will that throw off the results? Should I wait to see how the bike runs in the summer first? SO far I have only been able to ride it in 28 degree weather since changing the pipes. I did make sure I road it for atleast one hour and the oil temp when I was done was about 190 degrees.