Wait what? Let me explain. So I was looking at the old supercharger pulley and took some measurements and it is nearly same size as the pulley I put on. (Little over 57.5-57.7mm depending on where I measure it). I know this is smaller than stock so this means one of the previous owners had a stage 2 tune on this car. Also when I went to stage 1 I noticed a major hit in my MPG as my car was likely running too lean as the supercharge was spinning faster that stock and blowing the air to fuel ratio out of whack. I think the previous owner likely flashed it back to stock as the stock tune would be able adjust for the different boost from the supercharger, it just the stage 1 was not designed for the pulley to be there so that likely where the problem is. I'm going to give the stage 2 tune a few tank fulls to see if now my MPG comes back up.

That all said, I did look over my install pictures and the car itself and sadly I can't find any other major upgrades that I should be aware. I was really hoping to find the crank pulley and cooling upgraded, but it wasn't. The real question is what tune was on this car before? I've emailed all the major tuner and gave them my VIN to see I can find who it was. Kind of a shot in the dark if any of them reply. 

As for the EPL Stage 2 single pulley tune, it certainly has a lot more low in torque and generally more power along the full range. It is simply stupid easy to break loose my all season tires on a slightly wet road with traction control set to off. I'm ditching these tires went spring comes as I'm getting winter tires install this weekend and hope to run summer tires next post winter. As for the tune I'm happy with it. I've very interested to see if my MPG improve now that everything is back in sync. Only time will tell...

Stage 1 EPL engine tune and DSG tune has been successfully flashed today. EPL has awesome services, so I highly recommend them. The DSG feel so much snappier, as for the engine tune, the S4 is still going through the adaption phase so I'm not going to judge just get. As well EPL suggested I get some new plugs so I got those on order.

Next, I got my ECS Tuning Carbon Fiber Intake boot/pipe installed. This is connected to to my ported air box so it is not a true open air intake. I love the look of that carbon fiber in the engine bay. I had my daughter record this video so I apologize for the shake, I scared her a few times while revving it. From within the cabin the the supercharge whine is noticeable, but not over the top. I've heard that any new intake takes a few weeks for the sound to get louder so we will see how loud it gets.