I have my DSM 450s with the resister box and my VAFC. I am going to be running a RHB5 with 6 psi. Is the stock fuel pup good enough? Or do I need something bigger. If I do is there a in line one I can use. I dont want to drop the gas tank. I am affraid my patiance wount be up to par and I will get pissed and break something.

 

your fuel pump will be fine assuming it's working correctly.

 

i'd get a walbro 255 fuel pump just to be on the safe side.
your stock one will work, but it will be pushed beyond it's capacity with those bigger injectors. who knows how long it'll last. a bigger walbro would be real good. i wouldn't skimp on fuel, other people here do, some people blow up motors, others don't.

 

Is there a In line fuel pump I could use?

 

Just stick with the stock pump, until you go into double digits of boost. I wouldnt get a inline pump either, get a nice walbro intank. They are like 90 bucks shipped on ebay.

 

This guy was also very helpful when I bought mine.

http://www.autoperformanceengineering.com