Yes that D1 is too much, I have a P1 I'll trade ya even throw in some cash!!!!
You can tune for the D1 and you really need meth inj ,big injectors, fuel pump etc.
I'm running a 3.5 pulley on my P1 and have 11 lbs of boost

 

lol i was actually thinking of trading it for a p1! but the thing is im half way around the world for where ure at lol

the injectors come along with the kit, 52lb

if a 4.1 pulley is giving me 12 psi of boost will a 4.5 bring it down to 7-8psi?

 

You have the truck there???
You should ask ATI about the pulley thing but have your ser.# or they won't help ya.

 

I have seen 30 psi on 87 octane. I say doit.

 

Which is quite safe for the stock 5.3

 

P1SC on stock 5.3L...
8 #'s from 70k to about 170k miles...
10+ #'s from there to almost 219k miles
still running strong when I pulled it for a new forged build...

 

It costs me money just like it does everyone else. I dont have advantage over anyone.

Speed2, just run something moderate to let things last you some time to figure out how much further you want to take things later. Enjoy the truck.

R

 

My D1 made 12# at 5800 on my 5.3 with a 4.25" pulley.

 

Not only that but customers come 1st, Most of us who have our own shop don't have much time or energy to work on our crap, lol.


another thing about the procharger is you can run a smaller pulley because you don't see the high boost as often as the maggie or turbo guys, you'll only see 12 psi at high end of you rpm's.

Stat out slow and work your way up.

 

I am glad someone else gets this too.