I just installed a Twin Air and 86ed the stock air filter. It made a noticeable difference! I noticed a little quicker revveing and it no longer surges at 7420ft from sea level (where I live) like it did with the stock air filter. Love it! I also put on my new Distanzias (on the supermoto) last night, and now remember all the reasons I love these tyres. I rode to work today, there was a 10% chance of rain, and by the time I got halfway to work it was friggin pouring! These new Distanzias are king in the rain!!