What is the good brand that work well and does not cost a lot that can pump until 550hp

 

Walboro 340 gsm...many of the vendors have them...fairly easy to install...costs about $125.00. The optimum is hte Racetronix unit, which is about $285.00 and is plug-n-play. It also comes with the larger main wire for better voltage. If it were me I would go ahead and get the Racetronix unit (I bought the individual Walboro prior to the release of the 98+ Racetonix).

I am running the single Walboro with big gauge wire...everything else in the fuel system is stock...I put down 580 rwhp and 640 rwtque on a Mustang dyno, A4, converter unlocked. I have a boost-a-pump, but when I used it, even at a low setting, it just flooded the engine.

SDB

 

F-LT1 : http://www.racetronix.com/Racetronix..._Pump_Kit.html
F98 : http://www.racetronix.com/RX-F98-FPKG-2.html
F99+ : http://www.racetronix.com/RX-F99-FPKG-2.html

 

How many hp can the stock fuel pump handel?

 

Some die at 400HP and some make it past 500RWHP.
Depends on your motor's BSFC and the condition of the pump.
It's basically a crap shoot in many cases.
The Racetronix system will be like an insurance policy.