This one's a 'best offer' on ebay:
http://cgi.ebay.com/ebaymotors/aFe-M...spagenameZWDVW
It's all about how you want to spend your $$$, bro. On the 4.4, it ain't gonna really supply you with good gains in HP, it'll sound good when you open up the throttle (IF your X5 has a throttle
), and it'll look good when you open the hood. You want REAL power gains in the X, look to reducing the weight of the thing or supercharging, IMHO.
JV