Cold air intake / Magniflow or flowmaster

I am considering installing a cold air intake on my 2006 H2. Any one have a favorite brand? My local Hummer dealer installs them as well as the after market exhaust. Whats a good price for any of them installed? That way I can compare. I d rather have the dealer do it unless they are way too expensive. Thanks in advance

I have the Volant CAI and the Magnaflow exhaust. Love 'em BOTH!!
 
Going rate for the Volant is around $520. That includes the intake tube and the MAF. Magnaflow, around $540 installed!! BTW, this is USD but installed in Canada. May be different in the US!!