Take my advice - if you want to modify a T5 then by all means do - but budget for a bespoke Map from either Tim Williams or Shem.
Increasing the MAF housing / larger injectors or strapping a ruddy great blower on will all end badly with an off the shelf map.
These cars can be picked up cheaply - and are simple to modify up to about 260-280 bhp. But modifying them up over 300 is an art form - do it wrong & you might as well sit in the garden burning tenners - it'll be cheaper & less frustrating.
Go back to standard & hopefully you haven't knackered the engine - would be a shame to see another potentially good T5 get broken through misguided mods if the engine is slag. You're not the first & you are unlikely to be the last.
Good luck.
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