ive got an auto 91 300zx tt with jwt ecu and jet boosts and bolt ons and am having problems boosting 13.5 psi it does sometimes but not all the time it either runs 12 to 13.5 or barely 5 psi (more times it runs low boost) i dont have upgraded side mounts but should the heat make that big of a difference or is something else wrong? already considered boost leak but wanted to hear others thoughts as to what could be wrong..