550cc injector with stock fuel pressure regulator and MAF???
 

has somebody installed any 550cc injectors with stock MAF, fuel rail and fuel pressure regulator on a 7mgte???

it looks like one of my stock injectors is leaking, so i'm gonna have to change them pretty soon. I am planning to install 550cc, but i won't be able to replace the MAF and the fuel pressure regulator for a while.

Thanks

I'm no expert but I would not do it. It would cost less than the price of one RC 550 injector to send all six of your injectors to a specialist for a proper cleaning and flow/volume performance check. If one injector is dirty to the point of leaking, the rest of the injectors are likely to be dirty as well.
The 550cc injectors and adjustable regulator (and fuel pump!) are suplemental upgrades for the 4.0L Lexus afm upgrade. Read the Reg Reimer write up on it before attempting it (if you havn't). It explains in detail the point and effects of these upgrades.
Skipping steps (especially when upgrading) almost always yields less than desirable results. I would keep it stock until you are ready to do this upgrade completely.

Don't run the 550's unless you have a way of reducing their flow... 25% excess is a lot and more than the ECU can reliably handle.