Hey gang ! my question is actually in two parts. part 1) I am adding Vance & Hines slip-on exhaust to my 2000 V Star 1100 and a bikeMaster air filter. I've been told that I may possibly need to rejet my carburetor to make it run right . after making my upgrades, if my carburetor seems to be running fine, will rejetting it anyway give me a boost in performance? part 2) when I pay to have somebody rejet my carburetor (a mechanic) about how many hours of Labor should I expect him to charge me?