wanabecivicex

i just installed my turbo, im running just the down pipe and its bogging when i give it gas, i put on a makeshift exhaust to give it some back pressure and it runs fine then. but it comes loose now and then and when it does it bogs like CRAZY, ive tried adjusting the air/fuel but it still bogs either way i put it. anyone know why its doing this?
ps here's my setup, 8.5:1 pistons, t3/to4e turbo 7 lbs of boost