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SuperRivL67
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PostSubject: Downpipe L67   Tue Oct 16, 2012 8:22 pm

i know this topic has been discussed, most of the searching i did were old outdated post. I was looking for a 3" DP for my 97 L67. The one i have is leaking at the flex joint and has pin holes in the welds. A shop fabbed it up and didnt do a good job.
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AA
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PostSubject: Re: Downpipe L67   Tue Oct 16, 2012 8:44 pm

Not much has changed since the older posts were made, so the outdated info still applies. Two sources for 3" down pipes:

ZZP: http://shop.zzperformance.com/store/p/395-Bonneville-Downpipe.aspx

Hogan: http://www.ebay.com/itm/DP10-3-Down-Pipe-and-Cat-97-03-H-Body-Bonneville-/300082544178?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item45de503e32


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SuperRivL67
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PostSubject: Re: Downpipe L67   Tue Oct 16, 2012 9:02 pm

Thanks
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1998 Riv
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PostSubject: Re: Downpipe L67   Wed Oct 17, 2012 3:02 pm

No problems with the Hogan I've had on for a few years now, along with their cat.
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PostSubject: Re: Downpipe L67   Fri Nov 30, 2012 6:27 pm

I'm about to putt the zzp on this weekend
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PostSubject: Re: Downpipe L67   Thu Jan 31, 2013 2:42 pm

any particular gaskets needed for the hogan downpipe?
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PostSubject: Re: Downpipe L67   Thu Feb 14, 2013 6:24 pm

Is this what I want?
Hogan DP1

http://www.ebay.com/itm/DP1-Down-Pipe-W-Body-Grand-Prix-Regal-Monte-Carlo-/300082538100?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item45de502674
WB body's resonator

http://www.wbodystore.com/exhaust/148-high-performance-exhaust-resonator.html

What other parts will I need? A 3" gasket? I want to cut the cat too, so do I need a resonator to replace it and 3" pipe to connect everything?
study

Then there's ZZP's bonne DP.

http://shop.zzperformance.com/store/p/395-Bonneville-Downpipe.aspx
I assume because it's longer, it replaces the cat AND resonator where the Hogan pipe does not, right? Could I just get the Hogan, the resonator, and 3" pipe to connect everything? And then just a 3" gasket to connect to the main dump pipe, right? help

Either one of these setups, the bonne pipe or the Hogan + resonator, will replace my cat and rust can resonator, right? Is there anything else better I'm missing? I am going down the PLOG + downpipe road, if you haven't noticed. 3gears
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PostSubject: Re: Downpipe L67   Thu Feb 14, 2013 11:50 pm

I have an O2 emulator on hand until I can tune the sensor out of the pcm or whatever. Please advise which of my part lists is more favorable and/or if I am missing something, part or otherwise. Alls yalls advice is sincerely appreciated. Thank you. study
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PostSubject: Re: Downpipe L67   Fri Feb 15, 2013 5:39 pm

My trigger finger is itchin and i know I will pull it soon...

What do you all think about the differences between a ZZP Bonne pipe and a Hogan with a resonator?

I've got a lead on a new in box ZZP Bonne pipe on the cheap and I'm about to pounce on it.

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PostSubject: Re: Downpipe L67   Fri Feb 15, 2013 5:44 pm

You should go with headers. It will be cheaper in the long run if you plan to mod your riv any further.
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PostSubject: Re: Downpipe L67   Fri Feb 15, 2013 6:13 pm

69GSColorado wrote:
You should go with headers. It will be cheaper in the long run if you plan to mod your riv any further.
I am sure I will eventually get headers later on. My power goals for now will be achievable with a power log, ceramic crossover,and down pipe. Nice headers are expensive and that's what I want. I want nice used stainless headers and I want to do it right. When I am ready for install, maybe next weekend, I will have $260 wrapped up in my plog, crossover, and downpipe. I am OK with that.
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PostSubject: Re: Downpipe L67   Fri Feb 15, 2013 8:43 pm

Wow that is an excellent price. It seems like you have it figured out then. Also, I know it's not exactly the same thing, but I bought a zzp downpipe with a high flow cat for my dads regal and the quality was excellent. I definitely recommend them.
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PostSubject: Re: Downpipe L67   Mon Feb 18, 2013 10:08 am

Please educate me. I have a downpipe with the O2 bung hole in place. I also have an O2 sensor emulator. Is this redundant? I think there are two O2 sensors in the exhaust line? One before and one after the cat? Is this right? Will I plug the first one into the down pipe and cap the 2nd with the emulator?

Is that how all this works?
study
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PostSubject: Re: Downpipe L67   Fri Mar 08, 2013 9:02 pm

Who has wrapped their downpipes? Is it worth it? Something I should do pre-install?
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PostSubject: Re: Downpipe L67   Wed Mar 13, 2013 7:37 pm

yo yo yo. So my down pipe has a bungle towards the end where the rez will attach. Do I want to put a sensor in here or plug it up? If 'yes' on the sensor, is that sensor 2 that goes there and sensor 1 (closest to the rear exhaust manifold gets emulated?

But you can only do sensor 2 if you tune for it? And because I dont have a tuner, I would want to temporary plug it? and then stick the emulator on sensor 1, the sensor closest to the engine?

Am I even close on this?
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PostSubject: Re: Downpipe L67   Wed Mar 13, 2013 8:18 pm

Install both sensors, #1 closest to engine, #2 closest to cat. Disconnect #2 wiring and install emulator. Do not unplug wiring for #1 (don't emulate on #1).

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


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PostSubject: Re: Downpipe L67   Wed Mar 13, 2013 8:30 pm

what/where does #1 plug into? the only place on the downpipe is at the end where the rez goes.

so basically, dont touch #1, plug the bung hole on my downpipe, and emulate #2?


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PostSubject: Re: Downpipe L67   Wed Mar 13, 2013 8:49 pm

#1 plugs into rear manifold. Leave it alone.

I don't know why they put the bung in the DP for #2, maybe so it looks more legit? You need to plug it, And #2 sensor does the job.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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PostSubject: Re: Downpipe L67   Thu Mar 14, 2013 2:10 pm

AA wrote:
#1 plugs into rear manifold. Leave it alone.

I don't know why they put the bung in the DP for #2, maybe so it looks more legit? You need to plug it, And #2 sensor does the job.

usually for people who want to add a wideband sensor in addition to the PCMs sensors.
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PostSubject: Re: Downpipe L67   Thu Mar 14, 2013 2:43 pm

deekster_caddy wrote:
AA wrote:
#1 plugs into rear manifold. Leave it alone.

I don't know why they put the bung in the DP for #2, maybe so it looks more legit? You need to plug it, And #2 sensor does the job.

usually for people who want to add a wideband sensor in addition to the PCMs sensors.


Aint nobody got time for that! I'ma gonna plug it for now. Fuggin ZZP sells some screw in thing for like $5 for .5 gram of metal. dammit
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PostSubject: Re: Downpipe L67   Thu Mar 14, 2013 2:53 pm

Use your #2 sensor as a plug.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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charlieRobinson
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PostSubject: Re: Downpipe L67   Thu Mar 14, 2013 3:11 pm

AA wrote:
Use your #2 sensor as a plug.
scratch I thought #2 gets emulated and tucked away?
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PostSubject: Re: Downpipe L67   Thu Mar 14, 2013 3:19 pm

Correct, but the emulator does not attach to the sensor. It replaces it.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
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PostSubject: Re: Downpipe L67   Thu Mar 14, 2013 3:58 pm

ahhhh i see what you are saying. unplug the sensor, screw it in the bung hole, plug the emulator in where the sensor was, then tuck it away for safe keeping. Got it. So I dont need that $5 screw afterall?
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PostSubject: Re: Downpipe L67   Fri Mar 15, 2013 10:45 am

Quote :
So I dont need that $5 screw afterall?
Nope.

Quote :
screw it in the bung hole
Yep!

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
 
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