Just bought and installed a HMF pipe on my Foreman, when i was sold the pipe, i asked about jetting. The salesman told me sometimes, and in some cases u do not. Then i asked how would i know if you need to? He said your bike will act like it is starving for gas and high rpms. Well its on and i have ran the [email protected] out of it, no backfiring loss of power or anything of that nature....do you think im safe, or am i hurting my bike? just wanted some second opions, thanks chris