There was a comment from Arin@APR in the S3/Golf R Stage 3 thread that has sparked some conversation about what APR is up to on the B8/8.5 S4. Here's you place to discuss and speculate. Should be interesting to see where this goes....
Arin's Facebook post (in response to a discussion on twin-charging, and roots vs. twin-screw supercharger upgrades):
Efficiency: Small, large, thin, wide, short, long, 3 lobe, 4 lobe, twin screw, tvs, roots, etc.... It doesn't matter what you use, efficiency is going to make a very tiny difference. If you want more power, you'll need to turn up the boost, but unfortunately anything much over a bar gets pretty hot pretty quickly. Turbos, on on the other hand, are a different story.
Depending on your opinion of "high power" turbocharging is really one of the only ways to do it on pump fuel. Lots of challenges though. I know no customer would accept a kit from APR that wasn't 100% integrated into the factory ecu, with no cutting and trimming, no emissions deletes and tons of other requirements.
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