I noticed on their website that they have both systems displayed, but when I talked to a cs rep on the phone she only referred to the P600B. Is there a difference in these kits, and if so, what is it?

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85 TA LB9
Completely stock, 68K original miles

89 GTA 350
bored .030 over
mild head porting
.495/.502 CompCam
52mm TB
Open K&N
Hi-flo Cat
Flowmaster
SLP runners
SLP 1 3/4" headers
JET AFPR
3.70 9bolt

 

the (B) means billet.

it is the same unit except for the stronger billet impeller.

Later,
Chancey

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No more mods to come!

91 Black Pearl Z
5 spd
low miles
9psi ProCharger
3 row intercooler
paxton BTM(MSD)
MSD blaster2
ROH Snipers
Drilled rotors
350rwhp/400rwftlbs 305 Baby!

http://community-1.webtv.net/chanceyandbeck/THEDARKSIDE/

 

he is right but forgot to mention that with the billet impeller it has a higher redline limit which means you can run more boost with it. if i remember correctly, 60,000rpm for the 600 and 75,000rpm for the 600B. Just to let you know, the P600B is required for anything over 9psi.
to blacksunshine: how's it going. haven't seen you post in a while. how is that bad a$$ 305?

 

it's more like 60,000 max impeller speed on the 600b and in the low to mid 50,000's for the 600.