Hi so thought id share my experiences with my latest addon to my a4 cab. So my original turbo ended its life 2 weeks into owning this car. I had ordered a really nice oem replacement one however Yodel decided they would loose it... joys So needing my car back that weekend I set about finding another one that i could pick up the next day. Ended up buying a used k03 from an old b5 with no knowledge on miles etc.... but it only cost £60 so wasn't too fussed so long as it functioned. Well 10k miles later and its finally given up and started spraying oil out the case so it was time for a replacement. Now this time i was looking for something brand new and hopefully to give some more power. Now if you search k04-015 on ebay you are inundated with lots of shiney turbos for around the £150-200 mark. However its common knowledge that these are pot luck with if yours lasts 2 miles or 20,000 miles. However upon the search I came across one by a company called Mamba for around £530. Intrigued i delved deeper into what it was all about. So from the offset the images they used for the ad were superb, came with extra hoses, actuator springs for changing the rates etc, braided oil feed hose to replace the oem one that always blocks over time as well as a full fitting kit. Bargin in my eyes as that stuff all adds up. So i searched the company which id never heard of and its a relatively new company started by a guy who part owned another turbo company called Kinugawa which is fairly well know in the jap scene for cheaper replacement upgraded turbos. Now for one reason or another this guys left due to issues with his partner fiddling the finances. He wanted to improve on the quality of the turbos he designed for Kinugawa and thus Mamba was born. Anyway so there is little reviews out there about these new designed turbos apart from a few forum posts from some of the guys on the jap scene putting them in s13's and skylines and all of them had good things to say about the quality and figures they were producing. So the choice was buy an oem BW turbo from eurocarparts or take a punt and order one of the K04 pro kits they did for the A4. Specs: K03 externals bored out for slightly enlarged K04 billet internals with extended intake tip (stats stated rated for 260hp-300hp, no idea how true it is yet though) Being the type of guy I am I couldn't not test out something no one else id found had yet so i took to ordering one of the kits. It arrived within a week from Taiwan and upon opening the box i was pleasantly surprised by this beautifully built turbo. It came with all the kit mentioned above and a schenck core balancing sheet to show that its core has been properly balanced (an issue with other ebay k04 turbos). So pretty excited i went ahead and fitted this last weekend. All went really smoothly, old turbo out in an hour and then 4 hours to replace it and refill everything and flush the system etc... So onto the first drive. Well i primed the turbo before going out to make sure everything was properly oiled. So my car is running: Stage 1 Shark Remap, FMIC, Forge 008 DV, S2000 filter and custom heat shield, Silicone TIP, Custom cat back, etc... With the old turbo that was a bit rough I used to hit 1bar of boost which trailed off up to top rpm. First drive with this new turbo and the difference in acceleration was unbelievable. Boost kicking in with hardly any lag and topping out at 1.5bar its was like a completely different car. Now ive been driving it for a couple of hundred miles with no issues and been logging my AFR to make sure everything is safe and from what i can tell its all gone amazingly. I'm getting a slight boost cut at just over 1.5bar but i believe that is down to the stage 1 map and will be sorted once i have had a custom map done for the car and mods. So well thats my short write up about another possibility for people wanting more power from there a4's that don't want to go the many other routes you can go with turbos for a 1.8t.