I finally got this mod done. Made a difference, but not as much as I was expecting. My throttle was binding due to the serration on the zip tie, so I had to shave it till it was smooth. May be that's what made it thinner, hence not as quick as I was expecting. I might go in for a second zit tie after shaving the serration, to see if it makes things better... Unless any of you guys can give me a better idea?
I'm in no place to afford buying after market tubes, so please don't recommend that.