HELP having trouble with my MKIII

[Modded_supra]

i have a 89 turbo supra that is modded in pretty much every way except NO2. anyway... The other day i was out driving under boost pressure of about 12 lbs or so when it just started Bogging REALLY bad when ever the boost would kick in. Like it wouldnt let me go over 40mph because the boost would start to kick in so i would have to shift into different gears every 30 sec or so just to keep the boost from kicking in. I had a problem like this before and it was because the one of the intercooler pipes had become disconected but as far as i can tell everything is connected and should be working properly.. i just dont know what it could be. any advice would be SO helpful. Thanks!! Ryan

[Twin Turbo '95]

sounds like a boost gremlin.. check your boost pipes. it could be that a pipe slipped out of the rubber and now it leaks all the boost. check that your waste gate is tight enough and your dump valve. sometimes its just a small little problem making big shit. lol