I have the Fabspeed exhaust also and in comparison to some of the other garbage exhausts I’ve had, it’s the best up next to PSE. The Fabspeed is music to my ears.
You could have a baffle system made or make it yourself. I’ve got a pic somewhere of what I’m talking about.
What you’re hearing and not liking is resonance. I don’t think the Fabspeed is bad at all. My dad put a Tubi exhaust on his GT and the resonance between 1500-2000rpm’s was really bad. Having the windows up in the car made your ears hurt it was so bad. He had a guy design these baffles for his “megaphone” tips. Night and day difference. The car has the stock interior sound with a beast outside.
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