I just changed from Mobile 1 to Red Line. The engine seems to run a little quieter and smoother. I've always used a K&N filter. I also recommend following the recommended life of the oil between changes. If you dont track the car, you will be wasting your money changing synthetic at 3,000 mile intervals. There are enough studies and info out there that prove this. Just be sure to purchase a filter that also has the same lifespan.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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