Dusty Ratcliff

I have a 97' 5spd. truck with 94,xxx miles on it & this thing is blowing oil out the puke tube pretty bad??? the valve covers leak some too, but it looks like most of it is underneath the truck & coming out the puke tube???? I was thinking that it could be partly due to the new found boost & the sorry old stock exhaust that's probably all clogged up???? could the exhaust being stopped up cause too much pressure in the crankcase & therefore account for the oil finding its way out there????? thanks alot & I'll prolly be chopping the muffler/resonator off tomorrow, if I have to cut it off & leave it under the cab for a few days, it'd be better than the way it is surely, mayorder some 5" for my 01' & pull the 4" off it to put on the 97', thanks alot, Dusty