I bought this truck with this whipple supercharger, the pulley is around 4.25, want to buy a smaller pulley but don't know what size and put some cal speed long tube headers on, I get I tuned what kind of power do you think this make

 

We need more info!! What motor does the truck have? Year? Any other mods? How much boost? How much smaller of a pulley?

 

Somewhere between 300 and 800hp, depending on the kind of music you play on the dyno

 

its 2000 Silverado rcsb 5.3, it has shorty headers which I have read to do much, I think it has a stall and some tranny work, has I think about 5 or 6 lbs and I would like to get around 10 but do I need a custom tune

 

what is a good smaller pulley to buy

 

What kind of whipple supercharger is this, cant find anything on it

 

Side mount whipple?

 

So im guessing you bought this truck you have no idea whats going on with it? To see if it has a stall, brake stall it, anything over 1800rpms you have a stall. Sell the shortys and get yourself of 1 7/8 long tubes. What i would do is call the guy and ask him whats done to it. I wouldve been aware of this before i bought it. Also if you have a 4l60e and turn it up to 10 psi you may be buying a new transmission soon unless it has some "work" and even then you might be buying a new one.

 

it was a trade in at my work and got it for a good price, just trying to get some info on it, i am going to do long tube headers and probably get in tuned