Sometime soon I am going to be doing a 5.3 swap.

Here is what is going to be included in the swap.

-custom grind cam
-intake/full exhaust
-93 tune
-LSD and gears
-few other misc things for the engine.

by end of 2007 I am going to be putting on the trick front mount turbo.

Which would be ideal to go with for that setup? Would the level 4 suit me fine or should I go all the way and go with the level 5?

Thanks,
David