well i dont know about 400 but... first off... id put a K&N air filter ( very cheap, payed 220 CDN for mine ) then get a walbro 255 fuel pump which is 105 on ebay brand new... also... u might want to get your hg torqued but make sure the bolts can handle it and dont snap in 2... umm the 550 stock injectors should be fine... but also... you need a 3" full turbo back exhaust system... also... might wanna get your turbo ported... for more air flow at the waiste gate...umm... all i can think of right now just got off midnight shift tired as hell... ttyl sorry if this doesnt help any, but also... on the 20psi comment u better make dam sure the head gasket can get torqued or it will just blow anyways... 20 is a big number to aim for right away i'd try 15-16 at first... but u may need to upgrade the turbo, a T04p or a T70 would do a nice job... ttyl sleep time
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