I have a 90 gsx. I built a homemade intake from 3" pvc pipe and couplers. After i got it all installed i go and drive it and 2nd gear boost goes up until i hit fuel cut! very scary. I have my mbc screwed all the way in. I have the airbox cut so that it just holds the filter and mas thats it. Im going to try and put the acordian tube back on and see what happens. Right now im venting(no place to put vent tube in the pvc pipe) Any help would be great.