K&N air intake quesiton

[bmw_m3power]

I am looking at this K&N air intakes on ebay, here is the site.

http://cgi.ebay.com/ebaymotors/ws/eBayISAP...item=2458734520

do I need the heat shield for it or is ok just to buy it and install it like that?

or should I just get the rectangler filter for my original box air intake?

which is the best?

thanks

[breakpopin]

A heat shield is required to block the hot air from the engine from being sucked right back by the K&N filter...

also a properly made heat shield will ensure constant bhp being produced..

Heres a link on making a heatshield by yourself..
Heat Shield DIY


This filter will have better air flow compared to the rectangular drop-in K&N filter i'll say!!..

[Andrewsd1985]

That one is crap it doesn't get away from the engine far enough. If you are gonna go the cheap ebay route atleast get the tornado it has been proven to get dinan like gains.