Hi thanks for the quick response..I'm curious though...
If they are exactly the same why does the standard tank fit?
Did you put the standard tank back on? The mounting is the same. The only difference is in the height. The IS tank goes straighter up in the back, and is higher throughout. The bottom is the same. Guaranteed.
I have a IS tank on my 97 std. NO PROBLEMS. I know of a number of others who have done the same. NO PROBLEM.
Good luck. It almost HAS to be the airbox is not down far enough.
One other thing. There are rubber bumpers on the frame, for the tank to rest on. Any chance yours are still on the frame, but the new IS tank has them stuck to the tank also? That would cause a problem.
MP