Best turbo to reach 400bhp?
 

Currently running a jdm bugeye with full decat, cosworth panel filter and remap to 325bhp. What turbo would i need to reach 400bhp and how much should i pay for one??

Billet MD321h or a SC40 billet

Or a decent andy forest or Harvey TD05 20g,

You would need supporting mods ,manifold, up-pipe, 3" exhaust system, and larger injectors most likely.

Asking a mapper Like Simon (JollyGreenMonster) is always a good start as they normally know what is working best at the mo

When I asked JGM he said to me all I needed was turbo,injectors and a three port boost solanoid to get in or around the 400's. Already got panel filter, decat and fuel pump. :-)

Sc42 would be my choice :)

SC42 would be spot on and give a bit of headroom if you wanted more

SC's are good value or the equivalent Blouche which you can get from Slowboy.
There's also the 'MDX555-400' from Turbo Dynamics

SC42 would/will be mine too. Saw one make just over 500bhp last time I was at SSR. With supporting mods obviously!!