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I'm doing this for a friend. He recently purchased a new engine online dyno'd at 375 hp. He already has MAC shorty headers from before. I told him long tubes would be better, but he is kind of on a budget. How much hp could be gained from going from MAC shorties to 1 3/4" long tubes, or maybe 1 5/8" long tubes. He says if its only like 10 hp, he'll save his money and keep the shorties. And he's gonna be buying 3 chamber flowmasters, I told him 2 chambers sound really cool on my vette, but he says they're too loud. Oh well, to each their own, hehe.
Just looking for an answer(s). My friend asked me to help him. He's a Mustang owner, and I'm a Corvette owner. I figured this would be a good place to get some answers.