Downpipe L67

i know this topic has been discussed, most of the searching i did were old outdated post.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.

Not much has changed since the older posts were made, so the outdated info still applies.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

Thanks

No problems with the Hogan I've had on for a few years now, along with their cat.

I'm about to putt the zzp on this weekend

any particular gaskets needed for the hogan downpipe?

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?


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?

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.

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.

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.

You should go with headers. It will be cheaper in the long run if you plan to mod your riv any further.

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.

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.

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?

Who has wrapped their downpipes? Is it worth it? Something I should do pre-install?

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?

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).

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?

#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.

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.

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

Use your #2 sensor as a plug.

AA wrote:

Use your #2 sensor as a plug.

I thought #2 gets emulated and tucked away?

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

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?

Quote :

So I dont need that $5 screw afterall?

Nope.

Quote :

screw it in the bung hole

Yep!