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Old Jul 18, 2010 | 02:16 PM
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Default U-Bend delete
Noob question...

Can someone please explain?
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Old Jul 18, 2010 | 02:29 PM
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In your exhaust line there is a u-bend which restricts flow, replacing it with a straight pipe improves flow.

The u-bend for mine is actually a dent.


Others are just a pipe bent down then back up.
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Old Jul 18, 2010 | 02:54 PM
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Oh ok! Thanks. I'm going to be replacing that section with a test pipe when I do my headers.

But thanks again for the information.
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Old Jul 18, 2010 | 03:22 PM
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Old Jul 18, 2010 | 10:56 PM
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i was a little confused about the u bend as well..is it near the cat or something?
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Old Jul 18, 2010 | 11:04 PM
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Originally Posted by SSCoop
i was a little confused about the u bend as well..is it near the cat or something?
Yes - Stealth's pic is the downpipe / cat assy, I haven't seen one like JP's.

If you have one like Stealth's its not that bad - the squashed ones are some f'd up work.
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Old Jul 18, 2010 | 11:22 PM
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I have the same as JP's.
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Old Jul 19, 2010 | 12:38 AM
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Mine is like Stealth's (mid '06 production). Wonder why they went to that one?
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Old Jul 19, 2010 | 12:46 AM
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Originally Posted by Kazmaniac
Mine is like Stealth's (mid '06 production). Wonder why they went to that one?
Looks much less restrictive. Mine's the same one.
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Old Jul 19, 2010 | 05:57 AM
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Mine was the "dent" like JP's. (07 Monte SS) I have the Hogan down pipe now though, big difference.
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Old Jul 19, 2010 | 10:10 AM
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where can i get a down pipe at? i've seen a magnaflow hi flow cat is that just as good?
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Old Jul 19, 2010 | 10:16 AM
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so are you guys suggesting that 05-06 LS4's have the same DP as Stealths'? and 07+ have the same as JP's?
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Old Jul 19, 2010 | 12:17 PM
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I wonder what the engineers at GM were thinking when they did that? Probably just another means (like the intake) of detuning the LS4 for the 4T65..
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Old Jul 19, 2010 | 12:36 PM
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All W-Bodies with the LS4 and 3800 II/III have a U-Bend.

I am not sure if the 3100 and 3400/3500 W-Bodies had the U-Bends...
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Old Jul 19, 2010 | 01:23 PM
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Originally Posted by fieroguru
I wonder what the engineers at GM were thinking when they did that? Probably just another means (like the intake) of detuning the LS4 for the 4T65..
The u-bend is for clearance for the o2 sensor. Our crappy intake is to make clearance for the OPSU.
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Old Jul 19, 2010 | 01:30 PM
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Mine is like Stealth's. All I can say is that I can't wait for my catless DP to come in!! The u-bend on my 02 MCSS was really bad. I bought a catted DP for it and it made a huge difference.
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Old Jul 19, 2010 | 01:46 PM
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Originally Posted by 94ss06gxp
so are you guys suggesting that 05-06 LS4's have the same DP as Stealths'? and 07+ have the same as JP's?
Looks like an engineering change was done mid-run if that holds up.

Just as bad as that smashed Y-pipe on my '02 Camaro SS.
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