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I'm happy with my magnaflow. I have Gibson headers going into a 3" magnaflow SISO cat and a magnaflow (don't remember the number) behind it, 3" back to a single out. It's a nice deep sound.
Dynomax VT. Stainless steel. Great pricing, great performance. I LOVE mine, they sound awesome. Many aftermarket such as O'Reilly's and Napa and Rockauto sell them under the name Walker Exhaust. Same thing, same part numbers.