I used the Valvoline dex/merc (not maxlife though) and it said compatible with dex III. So not compatible with 2006+ Check yours again.
The 404 is a somewhat big cooler for a N/A but will work fine when mounted horizontally on the condenser. It's taller than the space vertically. I used the 403, and it's the largest size that fits vertically.
I know you saw my post on the other thread, but for reference: You can tap into the stock lines by cutting the hoses, and buying a double male coupler for 3/8ths hose, or you can cut the metal lines after the hoses and slide the hoses on there.
Are you planning on running the cooler independent or in series with the stock rad cooler? I did independent for a few reasons, one being no chances of the rad failing and sending coolant in the trans
