hi guys, I bought this exhaust but it’s not much different from my standard one (noise wise) if I bought this would it fit onto my Milltek exhaust and is it legal? Thanks https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/202221428579 https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/332390772263