[89 Cobra LX]

You're now a Mustang addict. I can see it now, one mod after another. You've joined an elite fraternity!

Start at 38 PSI (did you get a gauge?).

Take it out and drive aggressive. Wrap it out through third unless you detect pinging. If you hear the motor pinging (sounds like marbles rolling around in the motor) take it up a couple PSI and continue testing.

If you take it out and don't hear any pinging, try lowering the PSI by 1-2. Take it out and test for pinging. I wouldn't really go below 35 PSI. You should make an appointment for a dyno tune ASAP. It's the only way to garuntee the best tune.

If you want any help, let me know. We should go cruise tonight or tomorrow. I'm going to BBQ this afternoon and you're more than welcome to stop over. I've got plenty of brews...