What I don't understand is why you csn buy a cat back milltek system on eBay for roughly £450 but a turbo back, which is either decat or sportscat, for between £900-1200. What's so special about the milltek down pipe for it to be that price. This eBay decat is 3" bore and by looking at the photos reduces down to a 2.75" bore which is the perfect size for a milltek system which is also 2.75" bore. However, if you were to buy the cobra system, which is 3" bore, you'd have to hack the reducer off the eBay down pipe/decat to make it a complete 3" bore system. Maybe milltek have 2.75" systems for a reason, it is after all a tested product and is proven to provide the extra power. Someone with experience would have to give advise on wether a 3" bore system would create too much back pressure thus not providing the power that the milltek system is capable of. Doesn't sound massively different from a milltek i thought, maybe a little quieter?