more to keep the noise of the engine IN the engine bay, than any thing stereo related?

answers on a fiver pls.

http://www.caraudiodirect.co.uk/product_info.php?products_id=4858

I've never understood how putting it on the bonnet is supposed to make it quieter when the sound can just come out of the bottom/front of the car.

directional...if it comes out the bottom, less chance of your ears picking it up....

but if the sound comes out the top.....;)

thanks guys.

id' forgot i started this thread.

at least i know where to come.......

I've never understood how putting it on the bonnet is supposed to make it quieter when the sound can just come out of the bottom/front of the car.
Many cars now use undertrays with sound absorbent materials on them, to prevent the downwards travel of sound ;) Also 'flaps' in front of the radiator, which allow airflow into the engine bay, but prevent noise passing out when stationary.