Less restriction lets the engine run more efficiently, which means better MPG. Good luck replacing those bolts you broke... (I'm assuming you have the spring loaded bolts.) I broke one of them on my Teg and it cost me $9.23 at the Honda dealer for a new one and all I got was the bolt, no spring! I couldn't find anything that would work anywhere else. I almost had a $1 solution working that consisted of a bolt, a nut, and a washer, but I decided to go with OEM rather than spending more time half-assing it.