a9516 Posted May 6, 2016 Share Posted May 6, 2016 Hi there. I have a Focus Mk1 1.6. I've been thinking about changing the back box on it for a while but I don't know much about this. Before I bought it someone already put an aftermarket one on it but it doesn't sound great at all, it's also blowing from a mid section of the pipe that's been bodged together. So if I buy a new back box would I need to get any more pipe for any repairs, or would there be sufficient amount? Also I don't know what to get. I thought bout replacing the entire system but after looking on eBay at the cats it's confusing to say the least. My plan was to buy a new cat and a back box but some are really expensive and others that look the same are cheap, also doesn't the cat have to be verified or something? I think I prefer aftermarket back box as long as it's not loud or expensive; basically a wider pipe that sounds ok. Any suggestions? Quote Link to comment Share on other sites More sharing options...
stef123 Posted May 6, 2016 Share Posted May 6, 2016 That really depends if the mid section has been shortened. you would need to offer up a new backbox and see. Quote Link to comment Share on other sites More sharing options...
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