A resistor on the temp sensor is NOT going to produce good power on the S3. It will simply tell the ECU that the engine is operation at a cooler temp and increase fueling everywhere. Not a good thing on the S3.
Below is a recent graph from a 2007 S3 running CRM duals, ported stock header, stock air filter, 93 octane pump fuel.
Blue - As delivered, running internet downladed tune.
Yellow - After tuning to the needs of this particular bike.
The later S3s use a V2 Keihin ECU that can be a bit more work to tune correctly. This is very hard to do with a PCIII at part throttle, but TuneEdit (TuneBoy) makes easy work of this.
We are testing custom billet velocity stacks now. Initial testing shows a gain of 3.5% at higher rpm, and improved transient response on the 1050 S3s.