If your going to run a higher boost, help the car out by running a colder plug like NGK #6's. Also if you have stock intercoolers run 15psi daily in the Summer time, at the track if your running race fuel. Than 18 to 19psi is really putting a beating on them 370cc's. Winter time I run 16psi daily driving and still that same 18 to 19psi for any short term event. You can run that high on Dyno's as well. Meant to be only for short burst and not daily use and run a higher octane. They weaker of the two parts here is the injectors. Run lean and your motor is cooking and looks like this below :)
Damn, lot of low ballers here,,,,lol - 
