[THEFERMANATOR]

The factory one is pretty good if it has the optional towing one. GM ran the 11" wide by 4" tall one on some and a 6" tall on others. The problem I have seen though is the way GM mounted it. The inlet and outlet are both on the bottom, and I have seen them get slightly plugged and not flow through but the bottom 2 or 3 rows on the cooler. I rotate em 90 degrees and feed it through the bottom and out through the top, this way you know that you are using all of the coolers passages. I like this cooler as an easy add on one as it comes with line and adapters to hook right to the radiator. You could even hook it up along with your current one for extra cooling.
http://store.summitracing.com/partde...5&autoview=sku