Re: extra power?
What Jerkitt means, is that if you have increased the diameter of your wheels from 13" to 14", you need to reduce the profile of your tyres to keep to the same overall dia..
I.E. Was 185x60x13= now 185x50x14.
Hope this helps!. 
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My mods.(180 crank bhp.) include: cold air induction (with 12v fan & ram air), dump valve, FSE fuel pressure regulator, strut brace, rear (+2.5") spacers, Spax lowering springs & Pedders shocks. Subaru bonnet scoop & upgraded cockpit. Custom 2.5" exhaust with twin 4" tailpipes & 15"x7" alloys . Intercooler fitted + manual boost controller & oilcooler.
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