When I got my 98 Bandit, it had the Holeshot exhaust system, Stepped header, I changed to a larger tube, D & D, and from one Friday night to the next, I went from running 10.0's to running 9.80's in the 1/4. I am now running the Hindle stainless with Titanium canister.
I guess that my conclusion was that the Holeshot was good on the street, but not good for dragracing.