I recently put in a TXS MBC, and set it to about 13psi, just because I didnt want to over boost it. Later my friend put nitrous into his 525i and wanted to race me, so naturally i wanted to show him everything the rex was about, so i cranked it up to about 15.5. Everything was good with the boost (killed him) so i set it down back to about 14.5 psi. Then as i was running at WOT in second, the boost would peak at 14.5 and then gradually taper off as the rpms increased, at the redline it must have been down to 12, after i shift into third, it peaks again, and leaks only a little bit, probably about .5 - 1 psi. Can anyone tell me what this could be? I checked all the hoses going to the MBC and everything seems secure. anyone have any ideas?