40 Series Mufflers
40 Series Original Mufflers
Developed from Flowmaster&aps;s Top Ten race muffler lineup for use on the street and strip. Utilizing Delta Flow Technology, this muffler gives the best performance to higher horsepower vehicles. The Super 40 features a black, oversize case, which keeps the resonance down while the deep outside tone says it’s a Flowmaster!

Works in place of any other 40 Series muffler
Deeper, richer tone than original 40 Series muffler
The choice of performance street machine/rod builders
Constructed of 16-gauge aluminized steel or 409S Stainless Steel
Fully MIG-welded for maximum durability



40 Series Muffler Table
IN/OUT O/C C/O O/O
2.25' 42441 42442 42443
2.50' 42543
3.00' 43041 43043
409S Stainless Steel Models
2.25' 8042441 8042443
2.50' 8042541 8042543
3.00' 8043041 8043043


IN/OUT D/C C/D D/D
2.25'/2.25'
2.50'/2.50' 425404
3.00'/2.50' 430402
409S Stainless Steel Models
3.00'/2.50' 80430402
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