I just finished installing my Helix IC piping kit and now my boost has dropped way off.. with the stock pipes i was (with mail in dynoflash) boosting upto 21.5 then slowly back to 19... now with the kit.. i can only boost upto 15psi... and it jumps from 14-16. I checked all the fittings and they're all tight.. no leaks.. any ideas/suggestions?

 

do a boost leak test

 

Did you try adjusting your mbc after install? If you already tried that, then its got to be a boost leak of some sort.