First off, you'll lose the sequential system. Second you'll definitely need a FMIC, then an uprated Radiator, new Headers, decat/racing cats, etc. You'll have to have the gearbox rebuilt, etc to handle the power and will require a higher stall Torque Convertor, also suspension will need to be upgraded to handle the extra power, and braces to keep the body flexing.
If you're thinking you can just drop a pair of HKS in place of the Twins, I'm pretty much 100% certain it's not possible :).