does the stock exhaust have a pre and post cat o2 sensor?

i'm looking at the ebay headers cause im super cheap and it has bungs on in both places.

but i also notice that the zzp longtube comes with a o2 extension...?

 

the stock exhaust is 2.5" and the outlet of the ebay header/downpipe is 2.75? how would that even bolt up. it looks like its actually 2.5 and would both directly to the stock cat back

 

Yes it has at least both. Pre-cat o2 sensor monitors fuel mixture and post cat o2 is for emissions to let your computer know that your cat is working correctly. I seem to remember something about the LSJ having a wideband pre-cat o2 sensor but am not sure on that.

ZZP provides an extension because with longtube header it shifts the o2 sensor much further to the rear than on the stock manifold it is difficult for it to reach without it.

 

it would make sense because of it being boosted.

its hard in some of these ebay picutres to see everything.

the ebay headers all say the downpipe exit is 2.75 when the stock cat back is 2.5

i guess it won't bolt up??

 

maybe the ads are talking the outlet of the header into the downpipe is 2.75"

 

What matters for bolting up is your downpipe exit flange size. I think you know you are rolling the dice with ebay stuff "bolting up" any way you look at it.

 

ahh i can see in the pictures now the downpipe narrows down to 2.5" right where it bolts to the stock cat back

 

id rather have to modified the ebay stuff then spend 400-600 for a header. not going to happen

600/10hp = $60 per hp LOL

 

I'm not telling you not to, just saying ebay stuff is what it is. Typically the cheaper the kit the more "modifying" you have to do to make it work. Also, the material quality typically isn't as good with thinner walls so sometimes you have to re-weld them down the road.

 

thanks

 

Flex pipe on those are garbage. I've seen 3 people with them and theirs blew in months. And the stock exhaust is 2.25 in the largest area.

 

They are definitely hit and miss.

I had a eBay flex pipe on a twin turbo mustang setup and it latest but it wasn't very flexible at all lol

 

One of our older members did a review on this years ago. Basically he had to fix a couple welds and supply better gaskets, but said it was pretty solid overall.

 

That's a mustang. I'm just telling you that specific one made for cobalts has bad pieces on it. Why not just spend a bit more on something quality that will last instead of buying cheap parts you will probably keep having to replace. Pay once.

 

As I always say buy once, cry once. Ultimately what has happened when I tried to use cheap parts I ended up buying the more expensive option down the road anyway.

 

They are both made in china so they cant be too far off.

 

it wasn't specifically made for a mustang i just bought the actual piece by itself and welded up my own hot side. back then they didn't have pre fabbed ching chong kits for mustangs lol.

they are all made from the same place i'm sure they are shitty but it'll work.

 

I was talking about the zzp and ching chong header. zzp sources some of their stuff from china. I wouldnt be suprised if their longtube was as well.

 

There is a difference between things made in China and Chinese knock-offs. Quality parts can be made in China anymore.

 

i made good verified numbers with a badmab

 

Oh believe me, I know. Many people say craftsman is junk now because they are made in china. I always have to explain that just because it is from china, doesn't mean they cannot make quality parts.

In the case of zzp, there have been many complaints about the casting of dual pass endplates. I know alot of the grand prix guys had issues with their headers flange being out of whack. Not to say they don't make good parts, but they have had issues of their own.

 

Mine cracked in a few years. Same spots a lot of reported people claimed.

 

I have their LT header which I honestly think is a quality piece and have not had any issues with it. Now their dual pass end plate that I have did not seal around on of the press fit nipples when new and I had to fix it with water weld (they sent me a replacement unit but I wasn't patient enough to wait for it). They have had certain batches of products with issues but I think for the most part they try to correct problems moving forward.

 

Yea no doubt. Im not trying to bad mouth zzp here. They always correct their mistakes. Just pointing out the facts.

 

I bought a ZZP shorty header and their downpipe about 6 months ago and when I went to bolt it up to my exhaust it was about an inch too short. I could pull the exhaust to make it mate up but it put a strain on things and I picked up some NVH from it. I contacted them and they said my exhaust must not have been stock (it was). I was going to get one of their exhausts anyway but that kind of forced my hand. They did give me a little discount on it. Not bad mouthing them at all as their customer service is great but I guess my point is their stuff isn't always perfect either.

I had a 92 Sentra Se-r years ago that I bought an ebay header and intermediate pipe (downpipe) for and it fit without any problems. You never really know what you're going to get nowadays but I guess at least with a reputable company they usually try to correct any issue you may have.