GarageLine most likely have the Chinese manufacturing the exhaust. There could be possible shortcuts with pipebthickness, quality of the welds, and flanges. Most Chinese made exhausts are shiny. The AAM exhaust is hand made at their shop using 304 stainless steel pipes and flanges. Both are thick too. Of course they use a mandrel bending machine. So you're paying for the craftsmanship and quality. With GarageLine, you accept some risk and understand that it's not on the same level quality wise, power, though, they should be really similar.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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