I have Crawford HFC's and I do not regret getting them. The exhaust smell isn't bad at all, I only really notice it on start up while the car is not moving. I have the HKS exhaust, it did make it about 30% louder, and giving it a more throaty sound. And I like the extra top end power. IMO I don't like the way test pipes make exhaust sound unless you get resonated ones. It makes it sound raspy.
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Ford Diesel and Heavy Line Technician at your service. 
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