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  IGNITIONS OPTIONS
  DYNO PROVEN TO PROVIDE THE LARGEST HORSEPOWER GAINS FOR THE 96-04 V8 4.6L MUSTANG GT
 RPM OUTLET.COMSTRATEGY

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 4.6L Mod Motor.

We have invested many hours evaluating and refining each of the 4.6L 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.


NEW Power Options, NEW Cooling Options, Increased Savings !




SLP Modular T-304 Stainless Steel Cat-Back Systems

Take complete control over your vehicle's sound and performance characteristics, with a modular exhaust system from SLP. SLP's exclusive design allows you to switch between three unique muffler types in a matter of minutes. The future of performance X-pipe technology is here! Using groundbreaking design architecture first seen on SLP Mustang X-pipes, SLP Performance Parts® has developed a new line of modular cat-back exhaust systems that can be quickly and easily reconfigured to fit changing performance, noise-level, and sound-quality requirements. Simply loosen a few band clamps, swap muffler types, retighten, and you're done. No other manufacturer offers this level of convenience and versatility!

SLP Performance modular cat-back exhaust systems are built from aircraft-quality T-304 stainless steel -- stainless inside and out, not mild steel, not aluminum, not coated aluminum, not just wrapped with stainless on the outside for show. Coating techniques, such as aluminizing, can somewhat prolong the life of mild steel, but coatings suffer at the weld points. And, comparing aluminized steel to T-304 stainless steel is like comparing gold-plated metal to solid gold! T-304 stainless steel has the highest chromium content, making it the most resistant to corrosion, and therefore the most desirable material for a long-lasting exhaust system.


always in stock

    SLP " LOUD MOUTH "
    1994-04 Mustang GT / MACH I:


  • Added a consistent 25+ rwhp
  • Employs SLP’s exclusive modular technology
  • switch between muffler and resonator types in a matter of minutes
  • Loud Mouth resonators for minimal flow restriction and the meanest sound around
  • Dyno-proven to outperform competitive resonator-type exhausts
  • Engineered and built to OEM standards to ensure proper fit
  • Constructed entirely from mandrel-bent 304 stainless steel
  • Features show-quality polished resonators and 3.5" double-wall tips
  • For 1999-2004 SVT Cobra models



>>>GUARANTEED LOWEST PRICE<<<
Prices No One Can Beat
We'll beat any advertised price on listed Stainless Exhaust Systems and ship it Ground UPS FREE! * Continental U.S. Only

Part # Year Application Price
SLPM31007 99-04
(GT/Mach-1)
    SLP "LOUD MOUTH "
  • LOUD MOUTH Mufflers
  • Mandrel-bent 304 Stainless Steel Tubing
  • 3.5" double-wall T-304 tips with electromarked SLP logo
  • Lifetime Warranty
$ 417.95
SLPM31007A 99-04
(GT/Mach-1)
    SLP "LOUD MOUTH II"
  • LOUD MOUTH II Mufflers
  • Mandrel-bent 304 Stainless Steel Tubing
  • 3.5" double-wall T-304 tips with electromarked SLP logos
  • Lifetime Warranty
$ 440.95
SLPM31004 99-04
(GT/Mach-1)
    SLP "PowerFlo"
  • PowerFlo Mufflers
  • Mandrel-bent 304 Stainless Steel Tubing
  • 3.5" double-wall T-304 tips with electromarked SLP logos
  • Lifetime Warranty
$ 463.95
SLPM31006 99-04
(Cobra only)
    SLP "LOUD MOUTH"
  • LOUD MOUTH Mufflers
  • Mandrel-bent 304 Stainless Steel Tubing
  • 3.5" double-wall T-304 tips with electromarked SLP logo
  • Lifetime Warranty
$ 494.95
SLPM31006A 99-04
(Cobra only)
    SLP "LOUD MOUTH II"
  • LOUD MOUTH II Mufflers
  • Mandrel-bent 304 Stainless Steel Tubing
  • 3.5" double-wall T-304 tips with electromarked SLP logos
  • Lifetime Warranty
$ 518.95
SLPM31009 94-97
(Cobra/GT)
    SLP " LOUD MOUTH "
  • LOUD MOUTH Mufflers
  • Mandrel-bent 304 Stainless Steel Tubing
  • 3.5" double-wall T-304 tips with electromarked SLP logo
  • Lifetime Warranty
$ 470.95
SLPM31009A 94-97
(Cobra/GT)
    SLP "LOUD MOUTH II"
  • LOUD MOUTH II Mufflers
  • Mandrel-bent 304 Stainless Steel Tubing
  • 3.5" double-wall T-304 tips with electromarked SLP logos
  • Lifetime Warranty
$ 494.96
SLPM31008 94-97
(Cobra/GT)
    SLP "PowerFlo"
  • PowerFlo Mufflers
  • Mandrel-bent 304 Stainless Steel Tubing
  • 3.5" double-wall T-304 tips with electromarked SLP logos
  • Lifetime Warranty
$ 539.96

Click-On Price to Order







Part # Year Application Price
SLP31062 94-04
    SLP "Loud Mouth"  Bullet-Type Mufflers, Ford Mustang GT/Cobra, (pair)
$ 139.95
SLP31064 94-04
    SLP "Loud Mouth II"  Bullet-Type Mufflers, Ford Mustang GT/Cobra, (pair)
$ 185.95
SLP31065 94-04
    SLP " Power-Flo™"  Mufflers, Ford Mustang GT/Cobra, (pair)
$ 212.95
SLP31040 94-04
    SLP Catalytic Converters High-Flow , 99-04 4.6 Mustang (pair)
$ 179.95
SLP31039 94-04
    SLP Exhaust Tip, Universal, Polished 3.5" Double-Wall 2.5" inlet (pair)
$ 39.95
RPM003020 88-04
    Ford Oxygen Sensor Simulators, 1 pair (pair)
$ 59.95
RPM003322 88-07
    Ford Oxygen Sensor Extensions, 1 pair (pair)
$ 39.95

Click-On Price to Order



SLP Modular X-Pipe Systems
X-Pipe Full Assembly, 1996-04 4.6 SOHC/DOHC Mustang w/Cats

The future of performance X-pipe technology is here! Using groundbreaking design architecture first seen on SLP Mustang X-pipes, SLP Performance Parts® has developed a new line of modular X-pipes that can be quickly and easily reconfigured to fit changing performance, noise-level, and sound-quality requirements. Simply loosen a few band clamps, swap cat to no cats, retighten, and you're done. No other manufacturer offers this level of convenience and versatility!

SLP Performance X-pipe are built from aircraft-quality T-304 stainless steel -- stainless inside and out, not mild steel, not aluminum, not coated aluminum, not just wrapped with stainless on the outside for show. Coating techniques, such as aluminizing, can somewhat prolong the life of mild steel, but coatings suffer at the weld points. And, comparing aluminized steel to T-304 stainless steel is like comparing gold-plated metal to solid gold! T-304 stainless steel has the highest chromium content, making it the most resistant to corrosion, and therefore the most desirable material for a long-lasting exhaust system.


always in stock

    X-Pipe Full Assembly With/Cats :
  • Exclusive three-piece modular design makes
  • Upgrades to SLP Long-Tube Headers without purchasing a new X-pipe
  • Includes band clamps for easy interchangeability of cats and race pipes
  • Equipped with a true X-pipe crossover, not a poor-flowing clamshell imitation
  • Constructed entirely from mandrel-bent stainless steel
  • Equipped with factory O2 bungs (where applicable)
  • Fits 1999-2004 SOHC and 2001-2004 DOHC models

    Note: All 2004 SOHC and DOHC applications require O2-Sensor Extensions

Part # Year Application Price
SLPM31032 99-04
    SLP X-Pipe Full Assembly With/Cats
  • T-304 Stainless Steel
  • Mandrel Bent Tubing
  • Lifetime Warranty
$ 409.95
SLPM31030 96-98
    SLP X-Pipe Full Assembly With/Cats
  • T-304 Stainless Steel
  • Mandrel Bent Tubing
  • Lifetime Warranty
$ 409.95

Click-On Price to Order



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