You can run about 22-24psi max with those mods. I have 2 friends I race with and both of them have EVO9's built and tuned by Leafracing.com . One is an MR and the other is a regular EVO. Both of them are tuned to run 24psi. They both have basic mods. They've been running 24psi for a while now with no probs at all.