I have read through number of ur post regarding moding exhaust on our diesel engine. I wanted to go ur path of changing a 4.8/4.6l muffler but it was just too expensive to get one in Australia.

Regarding the turbo lag, the test vehicle I drove has less lag than my stock system with DPChip. I think they had also done alot of R&D changing the setting on the chip to get minimise of the lag which they will be complete re-programe to suit the exhaust during the installation.

Installation is booked tomorrow therefore should have the car back before end of week. Will also have dyno charts for the before and after exhaust to show how much power gain was obtained.

Have u chipped ur Powers1?