Ok, so I'm hoping someone can chime here and let me know what the problem may be.

I've got the APS ST kit, APS ST Exhaust, and upgraded WG spring. I had the car tuned for 425whp which on their boost gauge showed 11lbs of boost, my gauge shows 13lbs.

For the past ~3 weeks I've been seeing progressively less boost, and the car is noticeably slower. Now the most boost I have seen is 10lbs. I'm in Naperville IL and it's gotten much hotter here, and more humid...which is the only cause I can think of why I'm having this problem.

I'd rather not wait until it's colder to see if my theory is right, because I've got some fast cars to keep up with and I'm going to need that 3 extra lbs. If anyone has some ideas of the cause I'm all ears. Thanks guys...

 

nobody has any ideas or suggestions 'round here? c'mon...

 

Check for boost leaks..

 

Is your AFR under boost the same as normal?

 

i don't have a wideband unfortunatly so i can't be sure.