Borla ProXS 24” Muffler With 19" X 4" X 9-1/2” Case & 2-1/4” Dual Inlet/Dual Outlet
Highlights
- Universal, Oval Muffler
- Improves Sound/Performance
- Installable in 2 Ways
- Completely Reversible
Borla ProXS 24” Muffler with a 19" X 4" X 9-1/2” Case and 2-1/4” Dual Inlets and Outlets.
From a free-flowing design to a universal fitment, any driver can enjoy the potency of Borla’s 24” ProXS Muffler (400287). For excellent rust resistance, this muffler’s 2-1/4” tubing is made from T-304 stainless steel that is 100% welded. By using a high-temperature CFF acoustic material, it creates a drone-free experience. However, the internal X-pipe preserves the classic exhaust tone you know and love. Buyers can weld it on using the un-notched necks or install it with 3” wide, band-style clamps. Either way, it can be reversed at any time.
Features and Benefits:
- Universal, oval-shaped muffler
- 2-1/4” 100% welded, T-304 stainless steel tubing
- Rust-resistant construction
- Free flow design improves performance
- Uses high-temp, continuous-filament fiber (CFF) material
- Won’t cause droning
- Internal X-pipe enhances sound & performance
- Completely reversible
- Necks are un-notched for weld-on installation
- Can clamp on w/ 3” wide, band-style clamps
Specifications:
- Overall length: 24”
- Case dimensions: 19” X 4” X 9-1/2”
- Dual inlets & dual outlets: 2-1/4”
Please Note: Clamps are not included; they can be purchased under Borla P/N: 18003.
California Residents: Proposition 65 Warning
Related Categories: Mustang Parts, Mustang Exhaust, Mustang Mufflers, Ford Focus ST Parts, Ford F-150 Raptor Parts

Vehicle Fitment
This product will fit the following Bronco years:
This product will fit the following C/K years:
- 1988,
- 1989,
- 1990,
- 1991,
- 1992,
- 1993,
- 1994,
- 1995,
- 1996,
- 1997,
- 1998,
This product will fit the following C10 years:
- 1960,
- 1961,
- 1962,
- 1963,
- 1964,
- 1965,
- 1966,
- 1967,
- 1968,
- 1969,
- 1970,
- 1971,
- 1972,
- 1973,
- 1974,
- 1975,
- 1976,
- 1977,
- 1978,
- 1979,
- 1980,
- 1981,
- 1982,
- 1983,
- 1984,
- 1985,
- 1986,
- 1987,
This product will fit the following F-100 years:
- 1948,
- 1949,
- 1950,
- 1951,
- 1952,
- 1953,
- 1954,
- 1955,
- 1956,
- 1957,
- 1958,
- 1959,
- 1960,
- 1961,
- 1962,
- 1963,
- 1964,
- 1965,
- 1966,
- 1967,
- 1968,
- 1969,
- 1970,
- 1971,
- 1972,
- 1973,
- 1974,
- 1975,
- 1976,
- 1977,
- 1978,
- 1979,
This product will fit the following F-150 years:
This product will fit the following Focus years:
This product will fit the following Mustang years:
- 1964.5,
- 1965,
- 1966,
- 1967,
- 1968,
- 1969,
- 1970,
- 1971,
- 1972,
- 1973,
- 1974,
- 1975,
- 1976,
- 1977,
- 1978,
- 1979,
- 1980,
- 1981,
- 1982,
- 1983,
- 1984,
- 1985,
- 1986,
- 1987,
- 1988,
- 1989,
- 1990,
- 1991,
- 1992,
- 1993,
- 1994,
- 1995,
- 1996,
- 1997,
- 1998,
- 1999,
- 2000,
- 2001,
- 2002,
- 2003,
- 2004,
- 2005,
- 2006,
- 2007,
- 2008,
- 2009,
- 2010,
- 2011,
- 2012,
- 2013,
- 2014,
- 2015,
- 2016,
- 2017,
- 2018,
- 2019,
- 2020,
- 2021,
- 2022,
- 2023,
- 2024,
- 2025,