What's the difference between them. Any pros or cons?

 

The only difference between the two chargers is how the compressor housing is attached to the center section. WH1C uses a v-band clamp and the HX35 uses a large snap ring. Beyond that, they are identical from a performance standpoint.

 

Wat kind of performance does it give over the stock turbo? Wat do our stock turbos boost?

 

Not exactly the same...the 24V variants have a 58 lb/minute flow rating v. 52 lb/min for the 12V. The 24V have a 7-blade compressor wheel that has a 77 mm major diameter v. 83 mm for the 8-blade. In practice it does seem they're pretty close.
cheers,
Douglas