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Message: <blockquote data-quote="Alex_225" data-source="post: 148307" data-attributes="member: 79">Well I've had a result, I had the exhaust looked at by the chaps that built the PowerFlow backbox and they've told me that it can be modified to accept a 2 1/2" centre pipe as not only is the crappy patent part too small it's blowing where it's rusted through. So it means I'll now have a straight through stainless pipe from the cat back which I've been told will be b*stard loud but is the optimum for the set up I've got and should free up another 5-10bhp provided the welds on the pipe are similar to that on the K-Tec kit. Plus it'll cost me £150 for the work to be done rather than the drive to K-tec (£40-50 in fuel) and the £500 cost of their cat back.</blockquote>