Are they cheaper thank K&N. I have just an ok filter on right now its not that great, I've been wanting a better one but they're too expensive. What brands are there?

I run K&N in both my cars.... has made a difference in each of them.
The 91 gets better gas mileage, an extra 20-50km per tank.

The 97 seems to pickup off the line a bit better, and she "rumbles" a bit more with the K&N.

I definately recommend them.... I know there are others out there... but I'm hooked on K&N.

I've tried others. I keep coming back.

what does 20-50km translate to in miles??? Did you see an improvement in mileage on the '97?

That would be an extra 12 to 30 miles per tank 1 mile = 1.6 Km