If you go by diesel fundermentals MORE AIR IN - MORE EXHAUST OUT then look at the downpipe you will see that it is worth it. The stock d/pipe is 2 1/4 dia that has been run over by a fork lift - in other words really restrictive. Get the turbo outlet and 3 inch down pipe, then a 4 inch exhaust system for a 94 1/2 power choke. Then do the intake mod, either ram air or cowl induction. Put in your boost and pyro - now you can increase the boost and turn up the fuel. If you need more info let me know, so far have done 5 of these mods, some were easy - one was a real pita, the housing bolts (5/16 - 12 point) rounded, the up pipe bolts were frozen, had to cut the pipe.