I was growing tired of my MAC catback between the volume and the tone; so I ordered a set of the Summit Turbos. They are a little bit quieter at idle, but not much. AT WOT is where they make such a difference. They are nowhere near as loud as the MAC. I am going for more of a sleeper appearance on my car, if someone is stupid enough to overlook the whistling.
But overall, for the price (about $40), they aren't bad. That is, as long as they don't rust out.
But overall, for the price (about $40), they aren't bad. That is, as long as they don't rust out.