I'm currently in the process of seeking out a new Intercooler. Read a fair few threads and narrowed my search down to the Wagner and the Proalloy IC.
For the Wagner I've found the following info:
Competition intercooler has the following core size (610mm x 440mm x 65mm), providing a 10% larger frontalarea and 50% more volume compared to the original Audi S3 intercooler.
Wagner-Tuning "Competition" Core with high cooling performance and light weight (9,3KG).
And the Proalloy:
* Free flowing core 25% thicker and 16.5% larger frontal area over the oem unit.
* Extensive testing showed that the PRO cooler reduced the air intake temps to just 4 degrees above ambient. (The standard cooler only managed 16 degrees above ambient.
Im struggling to pick between the two, I'm no expert haha! I just want the best for my car, looking to map to stage 2+ or stage 3 by Christmas.