I recently bought and 05 MR and have started to mod it. ive done the following mods.

Bushcar air intake
RNR race core
HPF lower intercooler
Halman MBC
APS Turbo Back
Ebay o2 housing
Forge Motorsports BOV

after putting the boost controller on with the stock fm and stock intake with a KN i was running 21psi all time. After the RNR core and Bushcar intake the car starts to break up at about 19psi now so the car is at 17psi right now. So i decided i need the 255 pump now. After the pump will i be able to turn the boost back up? Lastly i have the ebay O2 housing an havent put it on yet will I feel a differnce with it on? Will i gain some of the spool back that I lost with the big front mount?

Thanks
Bill