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Message: <blockquote data-quote="Thomas_W" data-source="post: 140480" data-attributes="member: 9106">Depending on what brand intercooler it is, it could be the intercooler. I have heard of some "ebay" intercoolers loosing 3+ psi on cars b/c they are so restrictive, especially if its a tube and fin style (radiator basically) compared to the bar and plate versions. Also, is there any head porting done? If so this will also cause a drop in boost pressure b/c the motor is more efficient. Boost is basically a measurement of airflow restrictionMine does the EXACT same thing. I've come to accept this as normal for now since i am untuned.  With a proper tune, it shouldn't hang for so long i suppose.If they didn't take the car above 6k rpm's there's a reason for it.  You probably aren't pegging the maf, as if you are, the car acts like it is hitting the rev limiter and just wont rev any higher.My guess is, its not getting enough fuel above 6k rpm's and thats why it falls on its face.</blockquote>