[Holyterror]

Definitely limit the NOS. I still have my doubts about the QR25DE. The block is die cast, so it's a lot thinner than say an SR20DE. Very similar to a modern Honda or Toyota motor, and I've seen plenty of them melted by way too much NOS. I assume you've got a wet kit? The manifolds are supposed to be good, so you should get even flow to all the cylinders. Yes, it will certainly be a bit cheaper than a good turbo, but the turbo also doesn't need to be refilled, and will work for you all the time. With an electronic boost controller, you can set it at something moderate for street use, and when it comes time to smoke the tires, you can turn it up (maybe as simple as pushing the "scramble boost" button). I haven't seen a turbo QR25 yet, but I can almost guarantee you'll get more power from a Garrett T3 than from a modest shot of NOS. A hybrid turbo would cost more, but would give you more of the top-end grunt you'll want for racing. With some precaution, NOS or turbo will probably do it for you. Just remember that you should be fortifying your other components to deal with the added punishment you're giving the engine.