We installed a Progressive 2.5 bar system on this 2000 S4 today. We used a single 7 GPH nozzle. It already had an MTM chip and a 3" exhaust so we thought it would be a great economical mod to do and help with the heatsoak/KR that all these deal with.
This car had the factory airbox in place unlike my other S4 install so I had to find somewhere else for the pump. I found a perfect spot behind the drivers side intercooler. I did have to remove the pump bracket. I drilled a couple holes in this brace and used a hose clamp to secure the pump. I put a silicone coupler around the pump before clamping it.
I hate pulling these bi-pipes out.
I should get some feedback from the owner tomorrow on how they like the additional cooling.