first.. vtec*
second.. you need to do a whole lot of research man. get on honda-tech and start reading.
the size of your turbo depends on your goals, motor setup, fuel setup, ect ect

and can i put a turbo on a honda accord 03 V6 automatic transmission?

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I want to do it to a fairly un-used H22A or if providing I can get the money in time a K20A.

im thinking about starting a project car. i want to build an 88-91 crx si into a car i can take to the track on weekends. i chose a honda because parts are easy to find and are cheap for the most part. but im not sure what engine swap to go with. all i know so far is that it has to be turbocharged. i would like to keep it street legal so i can drive it over to the track. anyone have any suggestions on a decent engine to use? im not worried about cost, as this will be an ongoing project for somthng to do on my spare time and not a quick attempt to create a cheap fast and furious rip off.