I am wanting to build a custom exhaust for my 4 stroke. I have a ton of 7/8 handle bars laying around, but the header flange that fits my engine I want to buy has an I.D. of 1". Will the 7/8 tube slip right inside the 1" I.D. of the header flange? Will it cause any performance issues? Should I just find some 1" tubing? I really do not want to do that as I have a ton of handle bars with cool angles that will fit the bike nicely.... Thanks in advance guys!