not sure but for the price of service parts - its certainly worth changing. Have a word with Alyn at AS Performance as he will provide all parts at reasonable prices.
Changing plugs, leads, filters e.t.c. will certainly give it a better chance, but not getting over 50mph is probably down to something much more...
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Subaru Impreza WRX STi Prodrive Type UK 2002: 
"Tinkered With!" 
Maintained and Modified by Super Jules 
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RM Performance http://www.rmperformance.co.uk
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