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I think he was going for free flowing exhaust WITHOUT a "ricer" sound. 2.5 inch exhaust is plenty for his engine and it will reduce noise.. by far. Revving a stock truck motor with as loud of an exhaust as he could get, sweet lol.
If you're going for a turbo later on you might as well buy 3 inch like everyone says.. deal with the noise but know it'll be better for later. But the extra weight, minimal gain, maybe price isn't worth it if you plan to leave it stock. That's my opinion.
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