Stutter box will not build full boost at engagement. He may be leaving with a pound or two at best, but he's not into the two-step that long, plus if he was leaving with any boost at all it would be just blazing the track off, just saying. A 6 lb Nytro should run with the sidewinder up at around 200 HP don't see why everyone is all up in arms about it. MCX 180 kit makes an actual 200 HP at about 5.5 # of boost. They underrate their number some just like Yamaha is doing. My 180 MCX 1200 Doo kit dynos around 215-220HP with a muffler mod at 6.5 lbs of boost which is maxed out on stock injectors.
If he was up at 12 lbs on a stock compression engine running race fuel, you would not beat him no matter what tune and muffler you put in the Sidewinder in a Drag Race. Engines with compression and less boost in them make for better drag sleds even it the HP is not quite as high as the de-compressed engine with more boost.
The Sidewinders are not going to be the be all end all if that's what your thinking they are going to be. They will be nice trail sleds that are capable of making good power at a reasonable cost. They will have a factory warranty as long as you don't modify them, but they are not always going to be first to the stripe, don't expect them to be. They will get outrun by cheaper older sleds like turbo vipers, turbo 1200 doos, turbo nytros, and turbo cats. Its just the way its going to be, in the turbo game when you start getting into that 220+ HP range its whoever spends the most or has the most knowledge on how to extract power efficiently that wins.
If you have to be the fastest you have to spend and/or know the most. Been that way forever. Just because you bought a Sidewinder does not mean you will win every race. Break it in good and hard, get some miles on it then see how it does, you may get up there even with him if he's running 6 lbs of boost. Want to go faster you will need to give up the warranty.