no pressure test as of yet. the exhaust system is just the elbow and the dp is open and 3". i checked all the fasteners to the exhaust system when the motor went in but thats about it. i dont have any sign of a vacuum leak anywhere. the vac tree is all snug and all the lines are good quality. nothing dry rotted or anything. the IC system could be the culprit. i popped a pipe off the other day, but have since put it back on and checked all my t bolts. any other way to pressure test the system?