Originally Posted by ///Matt
This would cause a turbulence in the intake flow... no good. If you found a way to make the portion of the bolt/washer that protrudes into the intake boot flat, then cool.
Also, speaking of turbulence, that's the secondary job of the silencer. It lowers noise AND acts as a buffer for intake pulses.
Good info. If you look at the inside of the pipe, it's anything but completely smooth, particularly with the ridges from the telescoping plastic. The portion that the bolt head would rest would be contained within the recessed area, not protruding into the air channel. Of course, a flat, and round bolt head would be better than a hexagonal one that protrudes.