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Jul 18, 2010 | 02:16 PM

indynotch50

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From: Morristown, IN

U-Bend delete

Noob question...

Can someone please explain?

Jul 18, 2010 | 02:29 PM

JP_GXP

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From: Almost Arkansas, LA

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.

Jul 18, 2010 | 02:54 PM

indynotch50

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Launching!

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From: Morristown, IN

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.

Jul 18, 2010 | 03:22 PM

StealthV8

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Jul 18, 2010 | 10:56 PM

SSCoop

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From: Sicklerville, NJ

i was a little confused about the u bend as well..is it near the cat or something?

Jul 18, 2010 | 11:04 PM

Kazmaniac

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Quote:

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.

Jul 18, 2010 | 11:22 PM

williamGT

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From: Yellowknife NT Canada

I have the same as JP's.

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Jul 19, 2010 | 12:46 AM

AlabamaGuy

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Quote:

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.

Jul 19, 2010 | 05:57 AM

#10

Tappeter

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From: Central NY State

Mine was the "dent" like JP's. (07 Monte SS) I have the Hogan down pipe now though, big difference.

Jul 19, 2010 | 10:10 AM

#11

SSCoop

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From: Sicklerville, NJ

where can i get a down pipe at? i've seen a magnaflow hi flow cat is that just as good?

Jul 19, 2010 | 10:16 AM

#12

94ss06gxp

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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?

Jul 19, 2010 | 12:17 PM

#13

fieroguru

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From: Champaign, IL

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..

Jul 19, 2010 | 12:36 PM

#14

Bryan921SS

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From: Zeeland, MI

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...

Jul 19, 2010 | 01:23 PM

#15

CenTexSS

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From: Killeen, Texas.

Quote:

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.

Jul 19, 2010 | 01:30 PM

#16

Nick_Nasty's_GXP

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From: Buffalo NY

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.

Jul 19, 2010 | 01:46 PM

#17

Kazmaniac

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Quote:

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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