Big bore or NOS

[wannaride4]

I was hopping for some input, I have a 08 525 IRS with 4.1 FMF slip on, JD jetting kit and cut holes in my airbox, I feel it runs very good and dont really need any more power, its just a matter of wanting it. So whats your thought on big bore kits vs. NOS? I am leaning towards the 570 BB from thumper racing, but I have heard alot about NOS and it is cheaper.

[Colby@C&DRacing]

If you are happy with the power most of the time and just want more for drag racings or shooting a dune then the Nitrous is the way to go. We have done a few Boss Noss kits and in my opinion they are the best nos kit on the market no purging, bottle warming, or tuning needed, and the best thing you get true 15HP at the wheel for $800