Where can I purchase a new intercooler core with the following dimensions? Dimensions are 4.5" D x 20.5" W x 14" H.

Thanks for the help.

 

If you just want the raw core, contact Spearco. If you want one with the tanks welded on and everything, contact Bell engineering group in San Antonio. They can build anything you desire. They've been engineering turbo systems for F1 cars for 27 years.