Can anyone post up a part # or a price for that nice big heat exchanger that maggy uses on the CTS-V systems. Are they 3/4" in and out? I know someone here installed one on thier truck, but they didnt have a part number or manufacturer for it. I PM'ed Blown Chevy but he must be pretty busy cause i never heard back from him. I am thinking of upgrading my heat exchanger, what is better.......a thicker multi pass exchanger or one with more surface area like the CTS_V exchanger?

 

I say get the one that lets the most airflow around it, to let your radiator breathe, so you don't have your high ECTs again.