That sound brings back some memories! My dad had an 85 Mustang GT convertible when I was a kid. He eventually had it fairly souped up, I think he put different heads on it, different rear end, underdrive pulley, FLowmasters, etc. He sold it in the 90s because he got tired of driving a manual. He always says the only cars that beat him off the line were Grand Nationals and Vettes!
It’s just an off road H-pipe with welded delta flowmaster mufflers . Check my other video of my 89 mustang, that one has the flowmaster American thunder catback ..
