my 84 r100 came to me a bit of a "rat bike" and that is the way i have chosen to ride it for this summer. among the numerous little "issues" with the bike is the fact that the crossover pipe has been cut off and the ends (about 2" sticking inward from each pipe) have been capped. is this bad in terms of flow or engine performance? should i hack off the caped ends and fit an appropriately sized piece of tubing or just leave it? also can this be clamped on or does it have to be welded?