Order Status & Returns
Gift Cards
Help Center
1-800-345-4545
Vehicle Info NeededFLOWMASTERPART NUMBER: 389-842583
80 Series Cross-Flow Muffler Offset In/Dual Out: 2.5"
$18895
1 left in stock
Ships on Nov 02, 2026
Lowest Price GuaranteeOffset In/Dual Out
- 80 Series Cross-Flow Muffler
- Offset In/Dual Out: 2.5"
- Stainless Steel
- Case: 15" L (4" Thick)
- Overall: 21" L x 9.75" W
- Universal Muffler - Not a direct fit. Some adaptation required.
- Single inlet with dual outlets for a stock dual exhaust appearance (fits in the stock crossflow position)
True Dual Performance
Flowmaster's 80 Series Cross-Flow Mufflers offer true dual performance where only a single exhaust system will fit, commonly found on classic Camaros and Firebirds. The 80 Series Cross-Flow Muffler fits transversely behind the rear axle and in front of the fuel tank making it the perfect OE replacement. The 80 Series gives excellent ground clearance, aggressive tone and increased power output over stock.
Show More
Features:
- True dual performance
- Aggressive tone
- Stainless steel or aluminized steel
- Fully MIG-welded
- Single or dual outlets
- Perfect replacement for Camaro/Firebird configuration
Part TypeMuffler
Product LineFlowmaster 80 Series Cross-Flow Mufflers
BrandFLOWMASTER
Package Height4.5
Package Width9.8
Package Length24.1
Weight13.2 PG
Outlet Quantity2
Inlet PositionOffset
Inlet TypeWeld-On
Inlet Size (In.)2.5
Heat Shield AttachedNo
Body Length15 in.
Muffler Count1
Inlet Outside Diameter2.63 in.
Inlet Quantity1
Sound LevelAggressive
Outlet Outside Diameter2.63 in.
Muffler MaterialStainless steel
Universal Or Specific FitUniversal
Hanger IncludedNo
Inlet Connection TypePipe Connection
Outlet Diameter2.5 in (63.5 mm)
ColorBlack
TunableNo
Case Length15 in (381 mm)
Case ShapeRectangular
Body Width9.75 in.
Outlet Inside Diameter2.50 in.
Body Height4 in.
Outlet TypeDual
Outlet PositionDual Rear
Part CategoryPerformance Parts
ShapeOval
Exhaust Tip Quantity0
Inlet LocationOffset
Muffler TypeChambered (Transverse)
Outlet StyleStandard, without tip
Muffler FinishNatural
Mount TypeUses New Hangers (Not Included)
Inlet Diameter2.50 in.
Clamps IncludedNo
FinishHigh-Temperature Paint
ReversibleNo
Outlet Size2.5 in (63.5 mm)
Muffler Series80 Series Crossflow
QuantitySold individually
Overall Length21 in.
Material409 Stainless Steel
Internal ConstructionChambered
Body Material409 Stainless Steel
Inlet Inside Diameter2.50 in.
Outlet LocationDual
FitmentUniversal
Part FitmentSemi Universal
Vendor Part Number842583
Package Qty1
Package TypeEA
No Questions
No Reviews
Items You Need
![Preformed Exhaust Lap Joint Band Clamp for I.D. O.D. Slip Fit Connection [Fits 2 1/2 in. O.D. Pipe]](https://www.jegs.com/images/mini_200/500/555/555-30732.jpg)
JEGS
Preformed Exhaust Lap Joint Band Clamp for I.D. O.D. Slip Fit Connection [Fits 2 1/2 in. O.D. Pipe]
Part Number : 555-30732
$1199$13.99
You Save$2.00
JEGS
Part Number : 555-30732
$1199$13.99
You Save$2.00
ITEM YOU MAY ALSO CONSIDER
![Oval Straight-Through Performance Exhaust Muffler [Satin]](https://www.jegs.com/images/mini_200/600/642/642-12266.jpg)
Some parts are not legal for use in California or other states with similar laws / regulations
