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I read the first page of responses and I'm to lazy to read the next three but when I got my new Mac Axlebacks I thought the same thing. But really I believe it's all the noise it makes but you aren't going there any faster that makes you think you lost power. Really all axlebacks are about the same right?
I have a V6 with a single exhaust and I felt a loss in torque when I replaced the stock exhaust with the Pypes Streetpro Axleback exhaust. Adding a CAI/Tune helped!