555's limit you. Why would you continually pay a grand to go to a new set of injectors? Do it once, do it right. There is not a problem with street-ability. If you have the right injectors, and the right tune, the sky's the limit. I run 1000cc's on my stockers because they're Injector Dynamics' top-feeds. (Brett Dempsey tuned a 2.0L 4-banger to idle perfectly on 2200cc's using I.D.'s) If you get 740's, once you make your leap to bigger turbos/better breathing the injectors will be willing and able to handle the fuel needs.
There's no question, 555's are Dodo's in the making.
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