You have to remember that MIG pipes were designed for Euro spec bikes and were/are road legal in Europe. I never even had to change the jets out on my street 900rr, I spoke with manny (eurobikes) and the MIG tech people. In regards to jettting I got the same story everytime I spoke to anybody at MIG. They stated that the road legal pipes did not require rejetting the carbs. I had a MIG high mount full system on my Race 900rr and my street 900rr. I only got 2-3 HP with the MIG pipe on the track 900rr.
