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A tighter lobe seperation on the cam can realy help achieve the choppy sound your probably going for but on the 4th gens GMMG made a dual chambered glasspack catback that sounded amaizing. If they are not making a kit yet or you want to save a buck just order a pair of the chambered glasspacks from summit racing or jegs and have them installed at a good muffler shop.
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