RPM Outlet - We Take The Guesswork Out Of Performance Parts!
  DYNO PROVEN TO PROVIDE THE LARGEST HORSEPOWER GAINS FOR THE 05-08 MUSTANG 4.0L
How fast is our 05 GT? Click-here to find outSTRATEGY

In keeping with our goal of providing our customers with the best possible value, we have tested a large group of components specifically designed for the 4.0L V6 Mustang.

We have invested many hours evaluating and refining each of the 4.0L V6 Mustang products on our MD Chassis Dyno, to ensure that we could develop as much power as possible, as safely as possible.

The site menu on the left side of this page, lists the clear winners when it comes to “performance vs. dollar” value. Please check back often as we are always developing new ways to create more horsepower.




JBA Cat4ward® Headers
05-08 Ford Mustang 4.0L v6

JBA Long-Tube Ceramic Headers shown in this image

RPM is proud to announce the release of the new 50 state smog legal JBA Cat4ward® headers for the new Mustang V6

Make your new V6 Mustang run like a GT with JBA's Cat4ward® headers. The new 4.0L V6 is a big improvement over the old 3.8L with increased power and torque. Combined with the new Mustang chassis and transmissions - the base Mustang feels almost as strong as some of the older GTs. But the restrictive factory exhaust manifolds hold it back. JBA has extensive experience with the 4.0L V6 and set out to build headers that will open up the exhaust flow to allow the engine to breathe more efficiently. The result is a new Cat4ward® header system that features JBA's heavy-duty construction and patented technology to deliver the performance and reliability you expect.

Starting with an oversized exhaust port and smooth flowing mandrel-bent tubing - these headers open up the exhaust for increased performance and efficiency without compromising the factory emission equipment. Extra thick .375" CNC laser-cut flanges ensure a tight seal and trouble free performance without leaks from warping. Each kit comes complete with quality hardware, gaskets and instructions for a complete installation.

Note: These are the only headers available for the 05-08 Mustang V6 that are 50 state smog legal.. CARB E.O.# D-216-28

  JBA CAT4WARD HEADERS
Part # How To Description Price
  JBA1617S Click-Here for Instructions
    JBA Cat4ward® Headers
  • 1 5/8” Diameter Primary Tubing
  • Chrome Plated 14 ga mild steel primary tubes
  • 50 state smog legal CARB E.O.# D-216-28
$ 349.99
  JBA1617SJS Click-Here for Instructions
    JBA Cat4ward® Headers
  • 1 5/8” Diameter Primary Tubing
  • Silver ceramic coated, 14 ga mild steel primary tubes
  • 50 state smog legal CARB E.O.# D-216-28
$ 499.99

Click-On Price to Order




Pypes T-304 Stainless Shorty Headers
05-08 Ford Mustang 4.0L v6

Pypes Exhaust is introducing a brand new line of Mustang Headers!

The huge popularity of the 4.0L V6 Mustang has convinced pypes to offer a line of headers designed to match perfectly with their systems. Pypes now offer complete performance exhaust systems from your mustang. You no longer have to match Pypes exhaust systems with oever priced, low quality headers. You can order your entire performance exhaust upgrade to Pypes and rest assured that the fit and quality is what you paid for.

Pypes headers are constructed using T-304 Stainless Steel with primary tube diameter of 1 5/8”. High quality gaskets and hardware are included with each pair of headers.

    Pypes Headers Features:

  • 1-5/8" Diameter Tubing

  • T-304 Stainless Finish

  • One-Piece Laser Cut Flange

  • Fully Mandrel-Bent 304 Stainless Tubing

  • Gaskets, Hardware Kit Included

in stock


Part # Part Description Price
PYPHDR56S
    Pypes™ 304 Stainless Shorty Headers
  • Polished 304 Stainless Finish
  • Gaskets, Hardware Kit Included
$ 269.99
  Pypes Complete Line Of x-pipe back systems
  PYP-SFM68
    Pypes True-Dual X-Pipe Back System
  • Stainless Steel Street-PRO series mufflers (mild tone)
  • Stainless Steel Street-legal X-pipe, Mandrel-bent over-axle pipes
  • 4" polished stainless steel tips, clamps, hangers and hardware
$ 339.99
  PYP-SFM68V
    Pypes True-Dual X-Pipe Back System
  • Stainless Steel Violator series mufflers (agressive tone)
  • Stainless Steel Street-legal X-pipe, Mandrel-bent over-axle pipes
  • 4" polished stainless steel tips, clamps, hangers and hardware
$ 359.99
  PYP-SFM68VS
    Pypes True-Dual T-304 Polished Stainless Steel X-Pipe Back System
  • T-304 Polished Stainless Violator series mufflers (agressive tone)
  • Stainless Steel Street-legal X-pipe, Mandrel-bent over-axle pipes
  • 4" polished stainless steel tips, clamps, hangers and hardware
$ 399.99
  PYP-SFM69
    T-409 Stainless Steel MID-MUFFLER Stainless X-Pipe Back System
  • Emissions Legal 2½ T-409 Stainless Steel X-Pipe, w/stainless band clamps
  • Polished T-304 Stainless M-80 Mufflers, Mandrel Bent Piping
  • Polished 4-inch Stainless Steel Tips, Tail Pipes (requires cutting factory h-pipe only)
$ 349.95

Click-On Price to Order




in stock MOTOBLUE™ AXLE-BACK RACE PIPE

Why bottle up your Mustang’s high-horsepower engine with restricting, docile-sounding stock mufflers? If you’re looking for the best-flowing, meanest-sounding axle-backs in the business, look no further.

Install a set a specially designed MOTOBLUE axle-back RACE pipes, and replace that traditional muffler design, allowing your Mustang to provide unmatched power increases and a wicked "wide-open" sound. This affordable, easy to install kit eliminates the factory mufflers entirely, drastically reducing back pressure for enhanced power and a mind-blowing performance sound. Nothing else even comes close! You'll both feel and hear the difference! Gains of up to 11 HP are possible, depending upon the application.

With a slip fit stainless steel band clamp connection - This kit is a simple bolt-on and installs in 45 minutes or less.


Part # Part Description Price
MTE-504600RP6
    MOTOBLUE™ Axle-Back RACE Pipes
  • Constructed entirely from 304 POLISHED stainless steel mandrel-bent 2.5" tubing
  • Hand-polished, 4.0" 304 stainless tips for a show-quality appearance
  • Significantly lighter than the OEM muffler assembly, Installs in under 30 minutes
  • Pre-welded hangers, detailed instructions, and all necessary installation hardware
$ 109.95
  PYP-HFM-60
    Pypes Stainless Dual Exhaust Hardware Kit
  • 304 Stainless Exhaust Hangers, band clamps
  • Nuts Bolts and detailed installation instructions
$ 49.95

Click-On Price to Order

FREE U.P.S. GROUND SHIPPING - * Continental U.S. Only

* Note : 07½ models require #PYP-HFM-60 hanger kit.



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