Timing chain

Hi guys I've had my epic 12 years now and haven't changed my timing chain Wensley the best time to do it and how much do it cost as it's not a easy job an was will I benefit from. Will vector be more responsive as it's not the same as it was an not as strong as a pull like it was wen I 1st had her help please

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Check on replacing the timing chain tensioner and not the chain itself.