Flowmaster 952546 Super 40 Muffler - 2.50 Offset IN / 2.50 Center OUT - Aggressive Sound Noticeable interior resonance Deep Aggressive Sound Exhaust Note Race proven patented Delta Flow technology Excellent performance on high horsepower vehicles Deep aggressive to moderate exhaust note Moderate interior resonance. Muffler type - reflection and inlet position- offset Excellent performance on high horsepower vehicles Race proven patented delta flow technology No internal packing to blow-out