Super 40 Mufflers
40 Series Delta Flow Mufflers
Flowmaster's Delta Flow 40 Series two chamber design incorporates Flowmaster's patented Delta Flow technology. The "Delta" deflectors generate increased scavenging for better performance and reduced interior sound. Perfect for vehicles where an aggressive exterior tone is desired with reduced interior tone.

The quietest muffler option in our 40 Series two-chambered line
Reduced resonance over 40 series mufflers
Stainless steel 409S version backened by lifetime warranty
Features advanced two-chamber design & Delta Flow technology
Available in aluminized steel or 409S Stainless for harsh weather
Both styles are fully MIG-welded for maximum durability


40 Series Delta Flow Muffler Table
Part Number IN/OUT Configuration Sound Material
FLO9424402.25/2.25Center/CenterAggressiveAluminized Steel
FLO9424412.25/2.25Offset/CenterAggressiveAluminized Steel
FLO9424422.25/2.25Center/OffsetAggressiveAluminized Steel
FLO9424432.25/2.25Offset/OffsetAggressiveAluminized Steel
FLO9424442.25/2.25Offset/Offset Same SideAggressiveAluminized Steel
FLO94244222.25/2.25Center/DualAggressiveAluminized Steel
FLO9425402.50/2.50Center/CenterAggressiveAluminized Steel
FLO9425412.50/2.50Offset/CenterAggressiveAluminized Steel
FLO9425422.50/2.50Center/OffsetAggressiveAluminized Steel
FLO9425432.50/2.50Offset/OffsetAggressiveAluminized Steel
FLO9425442.50/2.50Offset/Offset Same SideAggressiveAluminized Steel
FLO94254002.50/2.50Center/DualAggressiveAluminized Steel
FLO9430403.00/3.00Center/CenterAggressiveAluminized Steel
FLO9430413.00/3.00Offset/CenterAggressiveAluminized Steel
FLO9430423.00/3.00Center/OffsetAggressiveAluminized Steel
FLO9430433.00/3.00Offset/OffsetAggressiveAluminized Steel
FLO94254222.50/2.25Center/DualAggressiveAluminized Steel
FLO94254322.50/2.25Offset/DualAggressiveAluminized Steel
FLO94304023.00/2.50Center/DualAggressiveAluminized Steel
FLO94304123.00/2.50Offset/DualAggressiveAluminized Steel
FLO94304223.00/2.25Center/DualAggressiveAluminized Steel
FLO9420402.00/2.00Center/CenterAggressiveAluminized Steel
FLO9420412.00/2.00Offset/CenterAggressiveAluminized Steel
FLO9420422.00/2.00Center/OffsetAggressiveAluminized Steel
FLO9420432.00/2.00Offset/OffsetAggressiveAluminized Steel
FLO8425412.50/2.50Offset/CenterAggressiveStainless Steel
FLO8425432.50/2.50Offset/OffsetAggressiveStainless Steel
FLO8430413.00/3.00Offset/CenterAggressiveStainless Steel
FLO84304023.00/2.50Center/DualAggressiveStainless Steel
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