05 Since the Indy 440-1 cylinder heads on our engine have raised exhaust ports and angled spark plugs, special headers are necessary for proper fitment. Tube Technologies, Inc. (tti) manufactures headers for nearly every Mopar application imaginable, and had just the parts we needed for this engine swap. The TTI headers have thick, 3⁄8-inch flanges and mandrel bent tubes. We ordered their stepped headers with primary tubes that step up from two inches to 21⁄2 inches before dumping into 31⁄2-inch collectors. We’ve always found TTI products to be top quality, and the ceramic coating not only looks good but provides a thermal barrier as well.