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I might be talking pish but as I understand it with the end pipes being so narrow better flow further up the system doesn't really have any effect, noise would be greater but can't see performance being affected (even on a larger system decat has very little effect).
Well i had my decat custom made at the weekend to match my custom system and do not know why everyone mak a deal out of the noise, mine sounds mint if i put my foot down but can also drive normal and you wouldnt even know it had a decat on
Off the shelf systems are overated imo