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I've had the macs for 6 yrs but I will change them for arh 1 3/4 eventually. The ceramic coating on the macs will peel once they're hit with rain and condensation from the a/c system. Then the surface rust begins. In the engine bay they're still new looking, however. They also hang lower on the drivers side than the passengers side (the collector to x pipe flange has self-clearanced itself a number of times).

Sound and performance are awesome, and they're also cheap. But they have flaws.