for that money i wouldnt count on it lasting, mate of mine just finished a rs conversion on his bonus ( and i stripped a rs selling at below market price and giving him lots of parts) and that still cost more than that, as jimmyc said.. mapping/tuning will do a good hit on £400 on its own.

not slagging you off mate but £400 not realistic, im looking to build similar for my mk5 fiesta and the engine set up (loom,management, rebuilding a decent spec lump) is 2k atleast