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Deep and Powerful Sound
They have 20% more exhaust flow than cast iron Vortec heads
The addition of the industry-leader in digital gauges provides the potent power + visibility combo that has no competition
1-1/8 in x 10 Spline
Flowmaster Super 40 Delta Flow Muffler - 2.5" Center Inlet / Outlet AA0710AF2T59 Deep and Powerful SoundThe Super 40 features Flowmaster's Delta Flow technology. It's larger case profile provides the best of both worlds of performance and sound. The Super 40 has that deep powerful sound of the Original 40 series but with all the benefits of performance and low interior resonance from the Delta Flow technology. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability. Features: Durable Fully Welded 16 Gauge Aluminized Steel 3