American Racing: 1999-2004 Mustang 4V Cobra Long System Headers, 1-3/4" or 1-7/8" Cats:With Cats which is the best design

which is the best design for these engines

RP2™ has strong initial bite

3L EcoBoost 4 Cylinder 3 x 2 1/4 Stainless Steel Off Road OEM Downpipe Connects to Factory Exhaust or Kooks OEM Catback Exhaust

We have one unit in stock that was test fit on a C7Z that is up for grabs

3 1/2" A Pipe X 8"

American Racing: 1999-2004 Mustang 4V Cobra Long System Headers, 1-3/4" or 1-7/8" Cats:With Cats which is the best designAmerican Racing Headers: 1999 2004 Mustang 4V Cobra Long System 1 3 4" or 1 7 8" If your high powered Mustang Cobra needs superior headers, go with the brand that leads the way in performance and quality. With primaries in 1 3 4" and 1 7 8, we have you covered from bone stock to over 1000 RWHP. Product features on this system includes: 100% Made in the USA Never Outsourced Made entirely of 304 stainless steel 3 8" thick laser cut flanges for a warp