Assuming you want to be able to use the FT, you will also need some injectors, I'd say get 550cc. The std MF is too small to meter the air the FT needs, so that wants changing for a 3 inch one. The fuel pump might not be able to hold it's own with the demand either so you should replace that too.
A 3inch downpipe would be very good to have.
My advice before you spend any money, is decide on the person that will tune it. Then discuss what hardware they are happy to work with for you. Rather than going the other way round and having to repeat buy.
Gavin
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