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Need advice on ZZP down pipe & Exhaust fitment/specifica
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2001Ls
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PostPosted: Wed Mar 21, 2012 3:44 pm    Post subject:  Need advice on ZZP down pipe & Exhaust fitment/specifica Reply with quote

My cat is destroyed. I took out the front 02 sensor today and drove down the street just to confirm that my sulggish acceleration and lack of power was truly due to the cat... The car runs with power with no 02 (I also have a p0420) so ow I am sure the cat is bad. I am going to need a new cat, and I like the sound the car will make with a new exhaust. I have stock 3.8 with stock exhaust manifolds.
Do these two items bolt up to my stock exhaust manifolds?
I was shopping around on ZZP and I want a downpipe w/ cat that has a rear o2 sensor bung. I think I found it. here-> http://shop.zzperformance.com/.....itemID=249 Would I need to buy or add anything to use this DP and cat with my stock exhaust?
Then I was looking at the ZZP 2.5'' cat back. Seems like a reasonable price (compared to what magnaflow costs)... they give you the choice of adding a resonator to your order. I just was curious if anybody knows if zzp means they will replace the resonator with straight pipe or mean for you to use your factory resonator. If anybody has a tip I would appreciate it. Here is a screen shot of what I'm looking at buying.
And heres a link
http://shop.zzperformance.com/.....itemID=249]
[/url]

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PostPosted: Wed Mar 21, 2012 4:10 pm    Post subject:   Reply with quote

They mean it comes without a resonator unless you add it

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PostPosted: Wed Mar 21, 2012 4:46 pm    Post subject:   Reply with quote

FWIW, I don't think it's a huge bargain compared to the Magnaflow kit. Considering once you add mufflers and a resonator you are coming in close to 500 bucks for an aluminized exhaust set up. I'd rather go to a local exhaust shop and have them fab something up than pay through the nose for a ZZP exhaust kit that isn't stainless.

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PostPosted: Thu Mar 22, 2012 10:53 pm    Post subject:   Reply with quote

I am retarded. somebody answer if you can. If I buy the zzp downpipe w/ converter and their catback system, and select "no resonator" will I have an exhaust that is complete? In other words, will the system go:
downpipe w/ cat-> exhaust piping-> mufflers.
or
downpipe w/ cat-> big missing hole -> mufflers?

In the pic on zzps site (which you can see here http://shop.zzperformance.com/.....haust.aspx) the writing in the pic says "3'' cat back w/o resonator". I would be getting the 2.5". This pic looks like a complete cat back but there is a straight pipe instead of a resonator. I need to know if I opt out of the resonator if there will be a piece absent from having a fully connected exhaust system, I would like the straight pipe opposed to the resonator as I enjoy grumbling.

Also I hear what you are saying about buying the full magnaflow kit. I just want to give zzp the business for some reason.

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PostPosted: Thu Mar 22, 2012 10:59 pm    Post subject:   Reply with quote

You would have a complete exhaust with a straight pipe in place instead of a resonator.

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PostPosted: Thu Mar 22, 2012 11:07 pm    Post subject:   Reply with quote

Thanks. This is my first exhaust. I have newb questions.
I am probably going to have to get a pcm too bc everything I read shows the aftermarket downpipes set off the p0420. I dont want the Engine light on all the time and I will need to pass inspection in November. I saw on zzps website that If I buy the downpipe they will send me a $50 credit upon core return of stock cat. I may buy the downpipe first. Then if I do buy the cat back I can save some money. I am a bit concerned with the loudness of the ZZP system w/o resonator also so I might want to do more research and see what would be a good choice for cat back. How much would a pcm without the rear 02 readings cost? I think intense is the company right? I am realizing that part of the reason my cat went is my *180 theromstat. I think that the lower temps made exhaust richer thus damaging the cat. If I get a *180 tune with a new pcm does it turn fans on earlier or change other settings?Thanx.

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PostPosted: Thu Mar 22, 2012 11:09 pm    Post subject:   Reply with quote

For a tuned PCM I would highly suggest Will @ Overkill. I have nothing but good things to say about this man.

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PostPosted: Thu Mar 22, 2012 11:12 pm    Post subject:   Reply with quote

The only PCM I would put in my car is Overkill's. I've read horror stories from people with PCMs from Intense and ZZP. Overkill can be a bit slow, but his PCMs are rock solid (which can't be said for Intense or ZZP...).

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PostPosted: Thu Mar 22, 2012 11:17 pm    Post subject:   Reply with quote

I forgot to mention in my last post....

I had an idea. I could gut the stock cat and get a pcm with rear 02 codes deleted. Then the only thing I have to buy is the pcm. No more clogged cat and no more engine light. Probably frowned upon by emissions standards but it might work.
lol I am just toying with this idea.

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PostPosted: Sat Mar 24, 2012 3:03 pm    Post subject:   Reply with quote

update:

I unbolted my cat today at the resonator. I banged on it and it sounded like it was full of gravel. I knocked out as much as I could bc why not not have a plugged up exhaust until my new downpipe comes in. Car runs soo much better when the cat isnt full of chunky-broken catalyst material.

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PostPosted: Sat Mar 24, 2012 8:37 pm    Post subject:   Reply with quote

billy101 wrote:
For a tuned PCM I would highly suggest Will @ Overkill. I have nothing but good things to say about this man.

I agree, OVERKILL RULES.

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PostPosted: Sat Mar 24, 2012 9:04 pm    Post subject:   Reply with quote

2001Ls wrote:
I forgot to mention in my last post....
I had an idea. I could gut the stock cat and get a pcm with rear 02 codes deleted.

If you get a stock (GM) cat you won't need the rear O2 code delet because a stock cat won't set a code. But with the price for a GM cat, I would get a pcm tune and good quality aftermarket cat. You'll pass emissions and have a better running car.
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PostPosted: Sun Mar 25, 2012 12:25 am    Post subject:   Reply with quote

zzp or magnaflow for cat? (eventhough the zzp uses a magnaflow) ....I also know there are some other companies out there.

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PostPosted: Sun Mar 25, 2012 1:19 am    Post subject:   Reply with quote

I would get the zzp stainless down pipe with a cat and a pcm with the po420 code deleted. You will get a less restrictive down pipe with u bend deleted, a cat for emissions and a tune. The pcm could even wait to see if you get a code. Don't forget gaskets, nuts and bolts. It's fun spending other peoples money.Laughing
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PostPosted: Sun Mar 25, 2012 1:08 pm    Post subject:   Reply with quote

IffyG wrote:
The only PCM I would put in my car is Overkill's. I've read horror stories from people with PCMs from Intense and ZZP. Overkill can be a bit slow, but his PCMs are rock solid (which can't be said for Intense or ZZP...).


Not to knock overkill (if i could do it over, i'd try him out from all the things I've heard). But I haven't heard bad things about intesne. ZZP I have, mostly about their trans issues, but is it just the same thing that intense does or am I missing something?

Side note: I had a ZZP pcm in my car for about a year or so ~15,000 miles and had no issues.

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