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Apr 16, 2015 | 04:25 PM

#11

schroederchevelle

Thread Starter

Joined: May 2012

Posts: 31

From: North Dakota

turbo monte, I will be taking out the U-bend myself without replacing the downpipe.

Apr 16, 2015 | 05:23 PM

#12

The_Maniac

Monte Of The Month -- December 2011
Monte Of The Month -- September 2014

iTrader: (2)

Joined: Apr 2010

Posts: 12,606

From: Mentor, Ohio

Quote:

Originally Posted by schroederchevelle

Alright, thanks guys. I'm not too worried about the finish of it. So I don't think ceramic coating it will be necessary. I've considered getting the high flow cat with the downpipe too but I don't want it to throw the O2 code. I don't know of anywhere around here that can delete it from the pcm for me. If I decide to get it I'll let you guys know how it turns out.

If you want the P0420 code deleted, I can help with that. I offer a small PCM service. Read the link below, I believe I cover everything in it. Feel free to PM or email me with questions:
https://montecarloforum.com/forum/pr...-3100-a-42773/

Quote:

Originally Posted by schroederchevelle

turbo monte, I will be taking out the U-bend myself without replacing the downpipe.

There really is more to the ZZP downpipe then just the High Flow CAT and u-bend delete. Below is a link about my downpipe swap.
'04 Monte Carlo SS - ZZP Downpipe

I actually cut open my old down pipe before sending it back. As far as the construction of the stock down pipe, I found everything ZZP said to be true (a little tighter on the inside because of being double lined steel and such). If you are not doing headers, I would not hesitate to doing a down pipe with all of this.
I actually did the downpipe before the PLOG and I noticed a little change for the better and it became another supporting mod to a bigger picture.

Apr 17, 2015 | 08:08 AM

#13

schroederchevelle

Thread Starter

Joined: May 2012

Posts: 31

From: North Dakota

Alright, when do you think it's a good time to change the cat? My car has 163k but the engine only has 14k on it. To my knowledge the cat has never been changed. Would a new car be a good idea?

Apr 17, 2015 | 08:23 AM

#14

ChibiBlackSheep

Monte Of The Month -- August 2014

Joined: Sep 2008

Posts: 25,145

From: Southeast PA

Quote:

Originally Posted by schroederchevelle

Alright, when do you think it's a good time to change the cat?

When it is bad. There's no real set time, all depends on how the car is running.

Apr 17, 2015 | 09:00 AM

#15

schroederchevelle

Thread Starter

Joined: May 2012

Posts: 31

From: North Dakota

Yeah that's what I've always thought. But it couldn't hurt to replace it anyway. Or should I just wait til it plugs up?

Apr 17, 2015 | 11:15 AM

#16

The_Maniac

Monte Of The Month -- December 2011
Monte Of The Month -- September 2014

iTrader: (2)

Joined: Apr 2010

Posts: 12,606

From: Mentor, Ohio

Unless you are upgrading to a performance cat or the cat fails, leave it alone. I know factory cars that are still running with over 200k on them.
To my knowledge there is no maintenance or recommended cat replacement interval.

Apr 19, 2015 | 10:14 AM

#17

turbo monte

Monte Of The Month -- July 2012
Monte Of The Month -- August 2016

Joined: Dec 2008

Posts: 5,056

From: ford city, pa

i also agree there is more to a downpipe then just getting a highflow cat and u bend delete. the factory downpipe is the worse part of the exhaust, if your not changing the downpipe dont bother with the plog. and if you decide to get a downpipe as well then at that point just buy headers.

Apr 19, 2015 | 06:21 PM

#18

zjerry

Monte Of The Month -- July 2011
Monte Of The Month -- December 2016

Joined: Jan 2011

Posts: 7,524

From: St.Louis , MO.

I installed a ZZP powerlog on my Monte Carlo SS Supercharged,
& I installed a ceramic coated cross over exhaust pipe & a down pipe with a high flow cat with a u bend delete..