It hasn't been that long since I got my reman installed and I'm still in the process of breaking in my engine properly. Since I already got my 2nd oil change recently I decided to give it a full boost test while I was on the highway. First my vacuum reading on idle was different from before, it stayed on 16 or 17 instead of the usual 15. Then when I put it up to 3rd gear and reved it to 4,000 RPM+ the boost only went up to 5lb. and when I was on 4th it only went up to 2lb. This was horrible, there was some pull but not how it used to be. I know it should be a steady 10-8-10 reading. Do you think there is a leak on my old cross over pipe? Is it time to go with the Y Pipe, or do you guys think there is something else wrong here?

 

My guess is that you have a vacume leak. Either that or you crossed a line somewhere. Double check all your vacume hoses.