You most certainly can run a 150 shot safely. It takes a good tune, a fuel pump up to the task and the necessary N2O safety stuff. I've ran a 150 for 2 years now on a 75,000 mile very well maintained motor with well over 200 track passes (~50 of those are nitrous passes) . If it blew tomorrow , I'd have to say it's been worth it. If you've never launched off a 5000rpm 2-step with 550 rwtq, you have no idea what I'm talking about.