you can do it with just a boost controller (either an electronic one or just a bleed valve). It's not massively advisable to do so without supporting mods though, although some people have got away with it.
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'94 version 1 sti.... sold
'95 Renault Cliotaurus 1.8 rsi..... For Sale... £400 or offers
'06 BMW 130i m sport
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