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but are you saying you have the 555's without the ECU? Most people have their jwt ecu reprogrammed to adjust the pulse width on the 555's. Are you sure your car doesn't already have a jwt ecu? Were these mods on your car when you bought it? What boost are you running and how? Are you using boost jets or Boost controller? If your mod list is current the most useful things to get next would be a boost controller to exploit the advantages of your 555's, gutted precats or down pipes, Test pipes/gutted cats to broaden your power range and an AFC. on stock turbos i've seen people vary any where from 320-380, but if you get an air fuel controller and tune your car while its on the dyno, maybe even do a timing tweak... then im fairly confident you can beat 350 and then some. The air fuel tunning really helps considerably. Most people dont actually have the 555's before upgrading turbos since they are so expensive. Since you do you can dyno with 18lbs of boost adn a timing tweak and get some great numbers. Good luck.

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