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Not sure if it translates to GTOs but I'll share what I experienced with the SRT-8s.
Pricing: I can't find Corsa catbacks for under $1100, I got my Magnaflow catback in the low $600s on Ebay. Both are stainless steel.
The Corsa has the patented anti-resonance technology. Its not an issue for Magnaflow except at low speeds, part throttle (like gently accelerating in 20-25mph zone).
From what I gather, the Corsas may have a better fit. Notice Corsa is linked to GM and Mopar for some of their optional exhaust systems.
Sound - personal preference, I just wanted something better than stock.
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06 Charger SRT-8, 413whp / 432wtq
12.71 @ 111mph
CAI, manifold spacer, tstat, cats/catback, Diablo
02 FXSTDI Softail Deuce
Apes and factory Purple
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