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I have a group a filter on mine, it's been on for years, no issues with it
Same. Plus the wastegate chatter back through it is awesome. Hear what others are saying though about charge temps and I guess I may be loosing a little perf due to this (possibly balanced out by simply how breathable it is...?) so thinking of adding a cold air feed (from front air dam) when the car goes in for a service.
 

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I had a group a on mine for about 5 years with no box and no issues. Sound is amazing, if you monitor the iat (inlet air temp) it does rise when stationary but drops to ambient temp once you start moving so yes, you'll loose power while your not moving....
 
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