...BTW, since you don't have the turbo in, be forewarned that the removal of the factory sound proofing is going to increase the noise in the cab substantially. I ended up pulling the turbo, and, using paper patterns I created, added soundproofing with layers of 1) fiberglass mat, 2) sheet lead (roofing supply, 0.040" thk),3) fiberglass mat,and 4) aluminum tape layers. I used pieces of aluminum weatherstripping stock to hold the fiberglass and lead to the top of the firewall tunnel. The whole process was tedious, but well worth it. My truck is now quieter inside the cab than when it was new... with the HVAC fan on inside, I can barely hear that old diesel, and most of what I hear is the exhaust from the low restriction system that comes in the kit...