1999-2004 Mustang GT 4.6L American Racing 1-3/4" Long Tube Headers w/ Catted X-Pipe

• 1999-04 Mustang GT American Racing 1 3/4" Long Tube Headers w/ X Pipe - Catted - High Boost Apps

• These long tube headers feature 304 stainless steel construction, thick 3/8" flanges, merge style collectors with scavenging spikes, 1 5/8 diameter primary tubes for GT Mustangs and 1 3/4" diameter primary tubes for GT and GT500's.

• These headers sets include direct bolt in X-pipe crossovers in your choice of high flow cats or off-road type with no cats.

• These headers have outstanding fit and provide an excellent performance gain over the factory exhaust.

• Gains of 15 to 20 horsepower are common on naturally aspirated applications and 25 to 40 horsepower on supercharged applications over the factory exhaust.

Custom tuning: This kit requires custom tuning. We recommend taking advantage of Stage 3's custom tuning package that comes with SCT's X-Calibrator 3 handheld tuner and qualifies you for our Loyalty Tunes program.

Stage 3 Tuning: Stage 3 Motorsports features the easiest way to get custom tuning for your Mustang performance parts. Fill out our simple tune sheet and submit it online after you've placed your order. If you need help, check out our tuning "How To" page or contact us directly.