K12 GREGGSON REAR TWIN EXHAUST

Jusat fitted a GREGGSON rear exhaust to my Micra; it has twin central oval outlet pipes. Looks fantastic, as quiet as the OE baxk but a good buy. Will post some p[ics when I get to download. Would recommend. £215 delivered - go to www.greggson.co.uk
 
Looks cool as hell but I was thinking of having a cat back twin outlet to left and right fitted to my k12 how easy was this to fit and also what type of noise and extra power does it give ?
 
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