Flowmaster 2.5in.IN(D)/OUT(D) 80 Series Muffler

The 80 series is a cross-flow design for applications where the muffler is mounted transversely behind the rear end. Each end of the muffler has an inlet and outlet. Delivering an aggressive muscle car sound both inside and outside the vehicle, this is an excellent replacement for Camaros & Firebirds with transverse mufflers. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability. 80 Series Crossflow - 2.50 Dual In / 2.50 Dual Out - Aggressive Sound Fits 1967 to 1974 Chevrolet Camaro and Pontiac Firebird.

• Aggressive Sound Exterior Exhaust Tone
• The original two chamber design
• Noticeable interior resonance
• Cross Flow Applications

The Flowmaster 80 Series Crossflow Muffler is designed for performance applications that use a transverse-mounted muffler behind the rear axle. With dual 2.5-inch inlets and dual 2.5-inch outlets, this cross-flow configuration provides an aggressive muscle car exhaust tone inside and outside the vehicle. It is an excellent replacement muffler for select Chevrolet Camaro and Pontiac Firebird applications equipped with transverse exhaust systems.
Constructed from durable 16-gauge aluminized steel, the Flowmaster 42582 is fully MIG welded to support long-term strength and reliable performance. Its original two-chamber design delivers a distinctive exterior exhaust note with noticeable interior resonance, making it well suited for drivers who want a more pronounced sound from a classic performance vehicle. The inlet and outlet arrangement is configured for crossflow exhaust layouts and should be matched to the vehicle’s existing exhaust routing before installation.
This Flowmaster 80 Series muffler fits select 1967 through 1974 Chevrolet Camaro and Pontiac Firebird applications, as well as listed 1975 through 1981 Pontiac Firebird applications. Verify the vehicle year, exhaust configuration, connection locations, and available clearance before ordering. Professional installation is recommended to ensure proper alignment, secure welding or clamping, and leak-free operation. This product is intended for automotive exhaust applications and may be subject to applicable emissions regulations.

Features:

• Aggressive exterior exhaust tone

• Original two-chamber Flowmaster design

• Noticeable interior resonance

• Crossflow configuration for transverse muffler applications

• Dual 2.5-inch inlet and dual 2.5-inch outlet configuration

• Constructed from 16-gauge aluminized steel

• Fully MIG welded for enhanced durability

• Fits select Chevrolet Camaro and Pontiac Firebird applications

Fitment:
Buick Regal GNX 1987
Buick Regal Grand National 1985
Buick Regal Grand National 1986
Buick Regal Grand National 1987
Chevrolet Camaro Base 1969
Chevrolet Camaro Base 1970
Chevrolet Camaro Base 1971
Chevrolet Camaro Base 1972
Chevrolet Camaro Base 1973
Chevrolet Camaro Base 1974
Chevrolet Camaro Base 1975
Chevrolet Camaro Base 1976
Chevrolet Camaro Base 1977
Chevrolet Camaro Base 1978
Chevrolet Camaro Base 1979
Chevrolet Camaro Base 1980
Chevrolet Camaro Berlinetta 1979
Chevrolet Camaro Berlinetta 1980
Chevrolet Camaro Berlinetta 1981
Chevrolet Camaro LT 1973
Chevrolet Camaro LT 1974
Chevrolet Camaro LT 1975
Chevrolet Camaro LT 1976
Chevrolet Camaro LT 1977
Chevrolet Camaro LT 1978
Chevrolet Camaro LT Rally Sport 1976
Chevrolet Camaro LT Rally Sport 1977
Chevrolet Camaro LT Rally Sport 1978
Chevrolet Camaro Rally Sport 1976
Chevrolet Camaro Rally Sport 1977
Chevrolet Camaro Rally Sport 1978
Chevrolet Camaro Rally Sport 1979
Chevrolet Camaro Rally Sport 1980
Chevrolet Camaro RS 1967
Chevrolet Camaro RS 1969
Chevrolet Camaro RS 1970
Chevrolet Camaro RS 1971
Chevrolet Camaro RS 1972
Chevrolet Camaro RS 1973
Chevrolet Camaro RS 1975
Chevrolet Camaro Sport 1981
Chevrolet Camaro SS 1967
Chevrolet Camaro SS 1968
Chevrolet Camaro SS 1969
Chevrolet Camaro SS 1970
Chevrolet Camaro SS 1971
Chevrolet Camaro SS 1972
Chevrolet Camaro Z28 1970
Chevrolet Camaro Z28 1971
Chevrolet Camaro Z28 1972
Chevrolet Camaro Z28 1973
Chevrolet Camaro Z28 1974
Chevrolet Camaro Z28 1977
Chevrolet Camaro Z28 1978
Chevrolet Camaro Z28 1979
Chevrolet Camaro Z28 1980
Chevrolet Camaro Z28 1981
Chevrolet Chevy II Nova 1968
Chevrolet Nova Base 1969
Chevrolet Nova Base 1970
Chevrolet Nova Base 1971
Chevrolet Nova Base 1972
Chevrolet Nova Base 1973
Chevrolet Nova Base 1974
Chevrolet Nova Custom 1973
Chevrolet Nova Custom 1974
Pontiac Firebird 326 1967
Pontiac Firebird 350 1968
Pontiac Firebird 350 1969
Pontiac Firebird 350 HO 1969
Pontiac Firebird 400 1967
Pontiac Firebird 400 1968
Pontiac Firebird 400 1969
Pontiac Firebird Base 1967
Pontiac Firebird Base 1968
Pontiac Firebird Base 1969
Pontiac Firebird Base 1970
Pontiac Firebird Base 1971
Pontiac Firebird Base 1972
Pontiac Firebird Base 1973
Pontiac Firebird Base 1974
Pontiac Firebird Base 1975
Pontiac Firebird Base 1976
Pontiac Firebird Base 1977
Pontiac Firebird Base 1978
Pontiac Firebird Base 1979
Pontiac Firebird Base 1980
Pontiac Firebird Base 1981
Pontiac Firebird Esprit 1970
Pontiac Firebird Esprit 1971
Pontiac Firebird Esprit 1972
Pontiac Firebird Esprit 1973
Pontiac Firebird Esprit 1974
Pontiac Firebird Esprit 1975
Pontiac Firebird Esprit 1976
Pontiac Firebird Esprit 1977
Pontiac Firebird Esprit 1978
Pontiac Firebird Esprit 1979
Pontiac Firebird Esprit 1980
Pontiac Firebird Esprit 1981
Pontiac Firebird Formula 1970
Pontiac Firebird Formula 1971
Pontiac Firebird Formula 1972
Pontiac Firebird Formula 1973
Pontiac Firebird Formula 1974
Pontiac Firebird Formula 1975
Pontiac Firebird Formula 1976
Pontiac Firebird Formula 1977
Pontiac Firebird Formula 1978
Pontiac Firebird Formula 1979
Pontiac Firebird Formula 1980
Pontiac Firebird Formula 1981
Pontiac Firebird HO 1967
Pontiac Firebird HO 1968
Pontiac Firebird Sprint 1967
Pontiac Firebird Sprint 1968
Pontiac Firebird Sprint 1969
Pontiac Firebird Trans Am 1969
Pontiac Firebird Trans Am 1970
Pontiac Firebird Trans Am 1971
Pontiac Firebird Trans Am 1972
Pontiac Firebird Trans Am 1973
Pontiac Firebird Trans Am 1974
Pontiac Firebird Trans Am 1975
Pontiac Firebird Trans Am 1976
Pontiac Firebird Trans Am 1977
Pontiac Firebird Trans Am 1978
Pontiac Firebird Trans Am 1979
Pontiac Firebird Trans Am 1980
Pontiac Firebird Trans Am 1981