We received this info from Dynatech. It compares their SuperMaxx headers to some of the other brands available -

http://estore.websitepros.com/stores/2081904/catalog/dynatechdifference.jpg

http://estore.websitepros.com/stores/2081904/catalog/dynatechinfo1.jpg

http://estore.websitepros.com/stores/2081904/catalog/dynatechinfo2.jpg

http://estore.websitepros.com/stores/2081904/catalog/dynatechinfo3.jpg

http://estore.websitepros.com/stores/2081904/catalog/dynatechhemi.jpg

Dynatech now lists their headers seperate from the mid-pipes. You have the option of getting high flow offroad connection pipes -

"A" + "B" = Headers & Catted System*
"A" + "C" = Headers & Non-Catted (Off Road) System*
Either of the above combinations will bolt up directly to your factory or aftermarket "cat-back" system.

124-733300A 05-Up Dodge Magnum/Charger/300C/Challenger 5.7 Hemi Headers $779.98 - Dynatech 5.7 Headers (http://estore.websitepros.com/2081904/Detail.bok?no=600)

124-733300B 05-Up Magnum/Charger/300C/Challenger Inter. Tubes w/cats 5.7 Hemi. $579.99 - Dynatech 5.7 Cats (http://estore.websitepros.com/2081904/Detail.bok?no=601)

124-733300C 05-Up Magnum?Charger/300C/Challenger Inter. tubes w/o cats $449.99 - Dynatech 5.7 Offroad Pipes (http://estore.websitepros.com/2081904/Detail.bok?no=602)

128-733300A 05-Up SRT-8 LX Platform Headers Only $859.99 - Dynatech 6.1 Headers (http://estore.websitepros.com/2081904/Detail.bok?no=603)

128-733300B 05-Up SRT-8 LX Platform Intermediate Tubes w/Cats $679.99 - Dynatech 6.1 Cats (http://estore.websitepros.com/2081904/Detail.bok?no=604)

128-733300C 05-Up SRT-8 LX Platform (Off-road) Intermediate Tubes (No Cats) $539.99 - Dynatech 6.1 Offroad Pipes (http://estore.websitepros.com/2081904/Detail.bok?no=605)

Tom