
Backed by MBRP — FFP is an authorized MBRP dealer and warranty claims are honored direct.
Authorized MBRP dealer. MAP pricing — the same price as MBRP direct. Expert exhaust installation available at our Thousand Oaks, CA shop. Questions on fitment or sound? Chat with Senna or call our specialists.
MBRP · Cat-Back · T304 Stainless
The MBRP S4704304 replaces your factory cat-back section with mandrel-bent 3-inch tubing routed through the factory hanger locations. No cutting or welding — bolt-on install at home with hand tools and a jack.
No tune required and no check-engine light: MBRP cat-backs leave the catalytic converters in place, so emissions stay intact while the system opens up the sound and flow path.
Built from T304 stainless steel — the most corrosion-resistant grade MBRP offers, fully welded and sealed at every joint, and backed for the life of the vehicle.
| Manufacturer | MBRP |
| Part Number | S4704304 |
| System | Cat-Back |
| Material | T304 Stainless Steel |
| Application | 2018-2021 |
| Shipping Dimensions | 47.2″ L × 16.6″ W × 15.4″ H |
| Shipping Weight | 78.3 lb |
| Warranty | Lifetime Warranty |
California Prop 65 product. Source: live Turn14 / MBRP catalog data; material, warranty and sound profile verified against MBRP’s manufacturer specs.
MBRP backs the S4704304 with a lifetime warranty on the construction and finish. FFP is an authorized MBRP dealer — warranty claims are honored directly through MBRP.
MBRP builds a true bolt-on system — mandrel-bent tubing, factory hanger locations, and every clamp in the box. Most enthusiasts have this on in an afternoon with hand tools. Prefer it done for you? Drop the car at our Thousand Oaks shop and our techs will handle the install and a fitment check.
We sell MBRP because it does what it claims: real sound, real build quality, and a warranty MBRP stands behind. No surprises.
Authority: Charles Siritho · McLaren Artura Trophy owner · Spotter for Branden Sorensen FD Pro (E46 LS+Whipple, 6th at Long Beach R1 2026) · 10+ yrs Mustang & Corvette specialist





MBRP performance exhaust — cat-backs, axle-backs, and more — for Mustang, Corvette, Supra, and beyond. MAP pricing always. Expert installation in Thousand Oaks, CA.
Send it over and a real crew member who works on these daily will get back to you — with answers, fitment notes, install tips, whatever you need.