Delta Flow® 40 Series Muffler by Flowmaster
- The quietest muffler option in our 40 Series two-chambered line
- Reduced resonance over 40 series mufflers
- Stainless Steel 409SS version backed by lifetime warranty
- Features advanced two-chamber design & Delta Flow technology
- Available in aluminized steel or 409S Stainless for harsh weather
- Fully MIG-welded for maximum durability

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FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.00 Offset In / 2.00 Center Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.50 Offset In / 2.50 Center Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 3.00 Center In / 3.00 Center Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow® Chambered Muffler 40 Delta Flow® Stainless Steel - 2.25 Offset In / 2.25 Offset Out - Aggressive SoundAdvertised Price $165.95$149.35Save $16.60
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.00 Offset In / 2.00 Offset Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.25 Offset In / 2.25 Center Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.50 Center In / 2.50 Center Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 3.00 Offset In / 3.00 Offset Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® Stainless Steel - 3.00 Offset In / 3.00 Center Out - Aggressive SoundAdvertised Price $170.95$153.85Save $17.10
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® Stainless Steel - 2.50 Offset In / 2.50 Offset Out - Aggressive SoundAdvertised Price $168.95$152.05Save $16.90
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.50 Offset In / 2.50 Offset Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.25 Center In / 2.25 Offset Out - Aggressive SoundAdvertised Price $152.95$137.65Save $15.30
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® Stainless Steel - 2.50 Offset In / 2.50 Center Out - Aggressive SoundAdvertised Price $168.95$152.05Save $16.90
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.25 Offset In / 2.25 Offset Out - Aggressive SoundAdvertised Price $160.95$144.85Save $16.10
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.00 Center In / 2.00 Center Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 3.00 Center In / 3.00 Offset Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.50 Center In / 2.50 Offset Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.00 Center In / 2.00 Offset Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.25 Center In / 2.25 Center Out - Aggressive SoundAdvertised Price $152.95$137.65Save $15.30
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.50 Offset In / 2.50 Same Side Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 3.00 Offset In / 3.00 Center Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.50 Center In / 2.50 Dual Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® Stainless Steel - 3.00 Center In / 2.50 Dual Out - Aggressive SoundAdvertised Price $170.95$153.85Save $17.10
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 3.00 Offset In / 2.50 Dual Out - Aggressive SoundAdvertised Price $145.95$109.95Save $36.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.50 Offset In / 2.25 Dual Out - Aggressive SoundAdvertised Price $152.95$137.65Save $15.30
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.25 Offset In / 2.25 Same Side Out -Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.50 Center In / 2.25 Dual Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 2.25 Center In / 2.25 Dual Out - Aggressive SoundAdvertised Price $152.95$137.65Save $15.30
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 3.00 Center In / 2.25 Dual Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
FlowmasterFlowmaster 40 Series Delta Flow Chambered Muffler 40 Delta Flow® - 3.00 Center In / 2.50 Dual Out - Aggressive SoundAdvertised Price $149.95$134.95Save $15.00
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40 Series Delta Flow
40 Series Delta Flow mufflers deliver aggressive exhaust tone with improved sound control compared to original chambered designs. Delta Flow technology helps reduce interior resonance while maintaining the deep, powerful exhaust note favored by performance enthusiasts.






























