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I purchased a whine mod kit from Shawn Foster and love it. Everything you need with quality parts and excellent customer service. 2018 Mustang GT Whipple Stage 4 Review I like the powerful whine with the stage 4. There was a little too much air flow noise and low end screech for my liking. I...

Good question. I inherited the exhaust from the prior owner. It has dual 4" tips that split from a single opening in the muffler. The muffler dimension is approx 14" x 10" with 3" pipe coming in.