Get it, it can add alot of horsepower cause it cools down the intake charge by evaporating the water/methanol in the intake air(same reason you get cold gettieng out of the shower). Adding a water injection kit should boost your hp and then because it also prevents detonation you can add more boost and/or bring your timing more advanced which should give you even more power. The only problem is you have to keep refilling the bottle...but thats not so bad. As for this kit...I have never seen it used, it just came out, but the company claims gains of up to 100hp. I'm sure on a street setup the gains would be more modest, depending on whether you up boost or not, but I'm sure you could gain 25+ horsepower for only the price of refilling the bottle.
"If you can't go fast with 90