My new H-Body 3 Inch Downpipe and High-Flow Cat Assembly. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-30-2006, 04:27 PM   #11
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This is not a place to get into a flame-war.

Keep this thread on topic.
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Old 05-30-2006, 11:52 PM   #12
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Default H-Body 3 Inch Downpipe and High-Flow Cat

You must consider that after the "Y" on the SSEi you have two 2.5 pipes totaling a 5.0 Inch output. This is plenty at the output. I do still have some 2.5 pipe after the Cat and before the "Y". I may get this changed out at a later date. I need to find a good 3 Inch resonator to install.
You may lose a little low-end torque but the 3800 has quite a bit to spare.
I believe it has close to the same amount of low-end torque as it has stock HP.
I believe I heard a figure of 231 for the torque. 231 would actually be more torque than HP for the stock non-supercharged 3800.


Thanks Tommy for being the guinny pig. You did a great job.
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Old 05-31-2006, 12:11 AM   #13
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Awesome! Thanks for posting your results!
Their website says 97-03 I might have to pick one up for my leaky exhaust that is soon to be replaced (no date set ).

Ed
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Old 06-02-2006, 09:07 AM   #14
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Default 3 Inch DP and High-Flow Cat

BillBoost37 has convinced me that maybe I shouldn't replace the remainder of my 2.5 Inch pipe after the Cat. He says that you need some back pressure to retain the performance. Unless I find out otherwise, from someone with the same make/model of vehicle, I am sticking with what I have now. I will post something if I find out anything different.
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Old 06-02-2006, 02:55 PM   #15
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there were members that went with a larger exhaust (3"), and lost performance...proven fact
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