At the wheels or at the crank? In either case I'd say your estimates may be close or just a little over optimistic. What mods do you currently have that put you at 230 and how was that measured?
The stock intake isn't THAT restrictive and close to stock engines see little improvement.... running a crap filter in the stock box... now that's another story. Once you get into the mid 300's the box has gotta go or be modded appropriately.
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