I'm looking around for a exhaust package for the 6.5td. I am wondering what size pipes you guys are running. I know anything I buy will have to be modded, but as long as the big bends are mandrel bent, I can work with lengthing/shortening the rest. imho, the 3" on my ford IDI is a little on the restrictive side, but I don't have any real comparison for the chevy. The service truck is just able to get out of its own way but I like a little more oomph for the project blazer. Anybody with experience on the 6.5td who can provide constructive feedback?