They all make about the same power so you're really looking at cost and sound. My Random Tech catback is pretty mellow at low speeds and cruising but it's a straight through muffler that gets pretty loud at WOT. Do some searching on Ebay and LS1Tech and you might score an almost new system cheap. Stainless would last the longest but is also the most expensive.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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