k&n air filter

...if its the panel filter, these normally retail at the £45 mark....so yes. Used one in my Trophy and resulted in a better return on fuel and a more crisp throttle response.....
 
Well its worth it as you'll make money even the induction type. Don't put it on your car as it reduces performance. As much as 10bhp on induction kits so im told. Panel filter would be ok on the your car though.
 
ye, i've heard the induction kits are red herrings and can strangle the engine, but a panel filter merely cleans the air-flow.