1999-04 Mustang MAC Pro Chamber Mid Pipe 4.6 by MAC Performance

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  • MAC Mustang Pro Chamber Mid Pipe (99-04) 4.6 PC9900

Increase horsepower, while adding MAC's signature sound, with this 1999-2004 Mustang Pro Chamber mid pipe for short tube headers!

Item #MAC-PC9900
MPN# PC9900

Your Price: $387.95

Market Price:$407.95
You Save 4.90 % ($20.00)

Low Stock Only 1 available

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  • 23RWHP Average Gain Throughout RPM Range
  • Signature Pro Chamber Sound
  • Increased Exhaust Flow


  • Pro Chamber Crossover
  • 2.5" Mandrel-Bent Tubing
  • Aluminized Steel Construction

What's in the Box

  • (1) Pro Chamber Mid Pipe
  • (1) LH Header Tube
  • (1) RH Header Tube
  • (8) 7/16" Studs w/ Nuts
  • (1) RH Manifold Gasket
  • (1) LH Adapter

Product Description

Mustang MAC Pro Chamber Mid Pipe
Quickly, and easily, bolt on an unforgettable sound, while also increasing horsepower, with this MAC 1999-2004 Mustang Pro Chamber mid pipe! Mac's patented Pro Chamber mid pipe helps produce more horsepower, and torque, by merging exhaust pulses into one area. By merging exhaust pulses, generated by your engine rotation, into a single chamber; this increases the temperature which increases the velocity and flow of your exhaust. This results in an increase in power and a broader torque band! MAC's testing has shown an average gain of 23 rear wheel horsepower throughout the RPM range.

Pro Chamber Signature Sound
Unlike the usual X, or H, crossover designs; MAC's Pro Chamber crossover produces a sound that is unlike anything else out there. Each tube, from your headers, flows into a boxed chamber, and then out of flow tubes that connect to your catback. You'll experience a mild hum at cruising speeds, and a menacing rumble during wide open throttle!

MAC Quality
MAC has produced exhaust products for over 45 years, and the quality and experience shows in this Pro Chamber. Constructed with 2.5" mandrel-bent tubing, this mid pipe provides increased exhaust flow with no restrictions. The aluminized steel construction is durable, and built to last. MAC's 3-piece design allows this Pro Chamber to fit both manual and automatic transmissions, as well as bolt up to stock manifolds, and shorty headers.

Emissions Note
This mid pipe has no catalytic converters, and is meant for off road, or track use only!

-Fits 1999-2004 Mustang GT
-Fits 1999-2004 Mustang Cobra
-Fits 2003-2004 Mustang Mach 1

This product is intended for off-road use only, and is not legal for use in emission restrictive states. Off-Road Disclaimer

MAC Products Warranty - Click Here

California Residents:

WARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov

Product Videos

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

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Vehicle Applications

Ford Mustang - 1999 (99) - 2000 (00) - 2001 (01) - 2002 (02) - 2003 (03) - 2004 (04)

About This Brand

MAC Performance
For over 45 years MAC Products has been delivering high performance products for the Automotive and Motorcycle Industry. MAC Performance is dedicated to building products that meet strict quality standards. They follow exacting guidelines during manufacturing in order to insure that you receive a quality, reliable product every time. They promise to do everything in their power to insure that your experience with MAC meets or exceeds your expectations.

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