Easiest way to do the U-Bend Delete Kit

LaFrance454 · 06-23-2008, 09:16 PM

I just sold my 02 chevy 2500 for a 00 3.8 impala. Just bought it today and cant stand not having the exhaust like my truck. People say A U-bend delete kit and a cat back is the answer. Cat back is coming but will it sound fine if i dont get rid of the U-Bend or what ever?

Heavy_SS · 06-24-2008, 06:36 AM

Quote:

Originally Posted by LaFrance454

I just sold my 02 chevy 2500 for a 00 3.8 impala. Just bought it today and cant stand not having the exhaust like my truck. People say A U-bend delete kit and a cat back is the answer. Cat back is coming but will it sound fine if i dont get rid of the U-Bend or what ever?

Dont know what you mean by U-bend?

Lingenfelter · 11-12-2008, 08:18 PM

I don't think you'll see much, if any, tonal change between having the ubend in there and not having it in there. The ubend may free up 2-3 horsepower, which is nothing all that measurable.

Your choice of muffler and resonator (or no resonator) will have a far bigger impact on the sound.

HeavySS: A ubend is a peice in the 00+ Impala exhaust systems where an O2 sensor is plugged in. It follows the catalytic converter and checks the efficiency. It is literally a bend in the pipe that looks like a U. It's a bit restrictive. Removing it means installing an aftermarket downpipe from ZZP or another company, or simply cutting out that section of pipe and replacing it with a straight section.

Removing the Ubend may cause a check engine light due to funny readings from that second 02 sensor. In 2000-2003 models, an O2 simulator can be used so that you don't need to drill a hole in your exhaust and reinstall that sensor... but you may fail emissions if they look under the car and realise you no longer have a second O2 sensor under there.

73impala · 11-12-2008, 08:20 PM

id go with flowmaster

04DetroitLS · 11-13-2008, 06:23 AM

leave the res in if you go flow IMO, the drone can get annoying

2004 Chevy Impala LS, DPP Headers, full 3" mandrel- Video

its a little long but was waiting for the idle to kick down ;)

I NEVER threw any codes when i deleted mine, i put the o2 90* clockwise from where stock is, just watch they dont pinch/scrape the wires when they relocate it. You wont hear a difference by removing it either.

BEST way to delete it is to grab a downpipe (ZZP/3800performance/etc), if you grab the long catless one, it'll bolt to exsisting cat back. The down pipe is the most restrictive part of the exh on our cars, then the u bend, 2 birds 1 stone ~$200. then you can figure what you want for catback after wards ;)

73impala · 11-13-2008, 06:29 AM

that impal sounds reallly nice

05ss45 · 11-13-2008, 07:25 AM

id go with the down pipe that has a u-bend delete like 04DetroitLS said 2 birds 1 stone, & it is one of the most restrictive parts of the exhaust.

04DetroitLS · 11-13-2008, 07:37 AM

Quote:

Originally Posted by 73impala

that impal sounds reallly nice

ty ;)

pimpstrocity · 12-06-2008, 01:02 PM

Quote:

Originally Posted by 04DetroitLS

BEST way to delete it is to grab a downpipe (ZZP/3800performance/etc), if you grab the long catless one, it'll bolt to exsisting cat back. The down pipe is the most restrictive part of the exh on our cars, then the u bend, 2 birds 1 stone ~$200. then you can figure what you want for catback after wards ;)

how much would the total increase in hp be with the u-bend deletion and the new down pipe? On a 04' ls with the 3800

04DetroitLS · 12-06-2008, 05:59 PM

>5hp, you'll loose bottom end torque but make up top end hp, it really helps the car if there are a few other mods (IE Hviii) OR THE S/C Cars, the dp/u bend are the most restrictive areas of the exhaust. If you buy an aftermarket dp w/ cat. Dont buy the ubend kit if you are going cat back, the exh.shop can do it for you ;)

06-23-2008, 09:16 PM	#1 (permalink)
LaFrance454 Junior Member Join Date: Jun 2008 Posts: 3	Easiest way to do the U-Bend Delete Kit I just sold my 02 chevy 2500 for a 00 3.8 impala. Just bought it today and cant stand not having the exhaust like my truck. People say A U-bend delete kit and a cat back is the answer. Cat back is coming but will it sound fine if i dont get rid of the U-Bend or what ever? __________________ eBay - eBay Motors

11-12-2008, 08:18 PM	#3 (permalink)
Lingenfelter Senior Member Join Date: Nov 2008 Location: Ontario, Canada Posts: 259 View My Garage Lingenfelter	I don't think you'll see much, if any, tonal change between having the ubend in there and not having it in there. The ubend may free up 2-3 horsepower, which is nothing all that measurable. Your choice of muffler and resonator (or no resonator) will have a far bigger impact on the sound. HeavySS: A ubend is a peice in the 00+ Impala exhaust systems where an O2 sensor is plugged in. It follows the catalytic converter and checks the efficiency. It is literally a bend in the pipe that looks like a U. It's a bit restrictive. Removing it means installing an aftermarket downpipe from ZZP or another company, or simply cutting out that section of pipe and replacing it with a straight section. Removing the Ubend may cause a check engine light due to funny readings from that second 02 sensor. In 2000-2003 models, an O2 simulator can be used so that you don't need to drill a hole in your exhaust and reinstall that sensor... but you may fail emissions if they look under the car and realise you no longer have a second O2 sensor under there. __________________ GMPP Duals, GMPP Handling Kit, NAIOA FWI V2, Silverstar Hi/Lo/Fogs, Viper 5900 Remote Start/Security. Top 10 poster at NAIOA. Top 10 poster at NewImpala. Last edited by Lingenfelter : 11-12-2008 at 08:22 PM.

11-12-2008, 08:20 PM	#4 (permalink)
73impala Member Join Date: Apr 2008 Location: Margate Posts: 56 View My Garage 73impala	id go with flowmaster __________________ Link to My Impalas Donk Rida

11-13-2008, 06:29 AM	#6 (permalink)
73impala Member Join Date: Apr 2008 Location: Margate Posts: 56 View My Garage 73impala	that impal sounds reallly nice __________________ Link to My Impalas Donk Rida

11-13-2008, 07:25 AM	#7 (permalink)
05ss45 Senior Member Join Date: Jun 2008 Location: maSShole USA Posts: 358 View My Garage 05ss45	id go with the down pipe that has a u-bend delete like 04DetroitLS said 2 birds 1 stone, & it is one of the most restrictive parts of the exhaust. __________________ SLP headers, 3.8/3.5 MPS,v1.0 DHP PCM, Grant built trans, intense I/S, Trans-Go shift kit, 2800 stall(Comp Cams custom grind 2 be installed)

12-06-2008, 05:59 PM	#10 (permalink)
04DetroitLS I LLLLLLLLLLOVE HAIRY MAN ASS Join Date: May 2008 Posts: 2,375 View My Garage 04DetroitLS	>5hp, you'll loose bottom end torque but make up top end hp, it really helps the car if there are a few other mods (IE Hviii) OR THE S/C Cars, the dp/u bend are the most restrictive areas of the exhaust. If you buy an aftermarket dp w/ cat. Dont buy the ubend kit if you are going cat back, the exh.shop can do it for you ;) __________________ Wanderson is still my bitch. See the NEW project: http://www.fullthrottlev6.com/forums...ad.php?t=59648

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