3" exhaust = POWER!! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-20-2004, 05:49 PM   #1
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Default 3" exhaust = POWER!!

Hey everyone!! Just got the car off the chasis dyno......
With 3.4 pulley, car made 221HP and 281ft/lbs

After installing 1.9 rockers and a custome 3" exhaust,

244HP and 327 ft/lbs torque!! Thats 23 WHP and an amazing 46 ft/ lbs at the wheels!! Great numbers!!
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Old 12-20-2004, 05:51 PM   #2
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I was thinking about doing that also, how much did you have to pay to get that done?
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Old 12-20-2004, 05:58 PM   #3
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Ahhhhh.....its all in who you know....Total exhaust cost, from the downpipe back, cost under $100.00.
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Old 12-20-2004, 05:59 PM   #4
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you should have dyno'ed it with the 2.5" or 2.25" exahust on it, to see its numbers. Even highly tuned cars like Willwrens dont use 3".
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Old 12-20-2004, 06:00 PM   #5
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yes the cars that are in the low 11'* and 12'* run the stock exhaust
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Old 12-20-2004, 06:03 PM   #6
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There was a slight method to my madness......Before anything, when I first got the car dyno'd, just for *&G'*, we dropped the exhaust and ran it to see what would happen. With no exhaust on it at all, and before the rockers, it pulled 237 and like 297. This is without any restriction. Adding a restriction would decrease power. People say you hurt low end torque with big pipes, on N/A motors I agree, with any forced induction over 10 lbs of boost, I disagree.
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Old 12-20-2004, 06:08 PM   #7
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quick question. If you are putting these mods on your 2002 SSEi you should run stock at 240hp.
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Old 12-20-2004, 06:09 PM   #8
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being too free flowing hurts, not helps. just ask willwren...he knows more about this than me.
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Old 12-20-2004, 06:17 PM   #9
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A 3" isn't that bad. Sure you lose a little low end torque, but that'* better for the tranny. It'* great for killing KR, and top end power increases.
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Old 12-20-2004, 06:22 PM   #10
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The 240 HP is not stock wheel power. Most are around the 190'* in stock form.
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