[img]i/expressions/face-icon-small-happy.gif[/img]Yes they have the spark arrester already installed. All you have to do to remove them is take three 5/32 allen bolts out of the endcap and slide them out, they are shaped like an ice cream cone. I have taken mine out several times and put them back in with no problems.

 

[img]i/expressions/face-icon-small-happy.gif[/img]Yes, s/a just means that they come with them.

 

I like the sound of the Procircuit dauls,they may not have the most hp, but they always have a good power curve on dyno testing.The price I gave for them was to good to pass up $529.

 

The K&N will flow more air meaning better zip BUT you will have to wash and oil more often than the twin air

 

thanks for the info