the real issue is dual pass core design. Only Griffin and one other manufacturer make their own radiator cores. The core for the heat exchanger is specific. Thats why the cost is so high. And I respect Zooomer and especially all the guys that work there they really are hardworking good guys. But in this case, chiwanese cores dont cut it, and at some point you really have to look closely at the cooling requirements.
There were three types of griffin h/e made. Well engineered, made in America, and a unique dual pass core design.One was the stock h/e. The second was the race griffin made in 2004 commissioned by GM,for the race Cobalts we built between thanksgiving and Christmas that year, and the third was the thicker h/e that was built by Griffin for ott; Griffin continue to make this for me on special order on a quantity basis. In '04 GM were reluctant to make the griffin any thicker than the second '04 design, as the overall cooling envelope gets skewed when a/c and h/e are placed in front of the engine cooling radiator. In racing we did not run the a/c rad, but that was still a concern. So I would prefer not to run so thick an h/e but Griffin wont tool back up for the particular core that GM comissioned. I have a couple of these left, one is in my Redline.
Zoomer in fact surveyed the stock griffin compared to front mount and said it was hard to beat, a while ago. I am sure those posts are lost.
I recomment that folks go to this link to inform themselves on chiwanese cores.
and lets see how it shakes out. Few people really have a good handle on cooling data recording.
and btw , for those interested in turbo's, compare the ZZP intercooler which is highly regarded, against the Performance autowerkes Garrett core intercooler.