2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque

2.4L Auto DP Vs LSJ DP

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Old 05-11-2009, 07:50 AM
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Finally someone proved the fact that the lsj downpipe is larger than the le5 downpipe. There have been sooo many arguments about this. OP, Thanks for clearing it up and placing them side by side !!
Old 05-11-2009, 08:16 AM
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i asked clear image automotive about this about a month or 2 ago and they had no idea or have heard of this
Old 06-10-2009, 07:25 PM
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yes i am reviving this thread.

only to ask if there is any ******* way to get this **** to work without having to spend a shitload of money on getting the **** welded here and there.

or would it make more sense for me to get a 2.4 AUTO dp and just gut the cat
Old 06-10-2009, 09:30 PM
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How about the xtc downpipe? Is it the same as the lsj?
Old 06-11-2009, 12:39 AM
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does anyone local have a 2.4 DP for an AUTOMATIC?

ill just gut the cat anyway.
Old 06-11-2009, 03:27 AM
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Originally Posted by blackbolt89
yes i am reviving this thread.

only to ask if there is any ******* way to get this **** to work without having to spend a shitload of money on getting the **** welded here and there.

or would it make more sense for me to get a 2.4 AUTO dp and just gut the cat
.,...LSJ stuff fits on non LSJ/automatic cars.
Old 06-11-2009, 10:45 AM
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Originally Posted by HunterKiller89
.,...LSJ stuff fits on non LSJ/automatic cars.
yeah. its on now and the ******* cat is hitting the sway bar when i go half throttle at 2,500- 3k and when i turn.

sure it fit fine. but the **** is vibrating and making sounds like hell.
Old 06-11-2009, 11:18 AM
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Sorry you found out the hard way...no way around having to get the LSJ DP adjusted to fit right on the auto equipped Cobalts.
Old 06-11-2009, 11:23 AM
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tagged.. very interesting
Old 06-11-2009, 12:21 PM
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well im gonna fight this ******* thing to the death. lol

im going to see if i can pick up some header wrap to wrap around the sway bar then tomorrow after work im gonna take some clamps and pull up the second exhaust hanger to the chassis. it should give me an extra inch that the cat will be pulled up.

theoretically. but we all know that nothing goes as planned on the cobalts. :frown:

or is there anyone thats local to NJ thats willing to sell a 2.4 DP for the auto trans. i'd just get the cat gutted anyway. no sniffer tests at inspections stations, otherwise i would also get a nice 10k fine for deleting SAI as well. lol
Old 06-11-2009, 01:25 PM
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Originally Posted by blackbolt89
well im gonna fight this ******* thing to the death. lol

im going to see if i can pick up some header wrap to wrap around the sway bar then tomorrow after work im gonna take some clamps and pull up the second exhaust hanger to the chassis. it should give me an extra inch that the cat will be pulled up.

theoretically. but we all know that nothing goes as planned on the cobalts. :frown:

or is there anyone thats local to NJ thats willing to sell a 2.4 DP for the auto trans. i'd just get the cat gutted anyway. no sniffer tests at inspections stations, otherwise i would also get a nice 10k fine for deleting SAI as well. lol
Problem with gutting a 2.4 DP is that the 2.4 DP pipe is only 2" diameter.
Old 06-11-2009, 02:08 PM
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BUT its the only DP that will fit a 2.2 auto with no problems.

how big is the LSJ? 2.5?

nvm i found the answer.

but the real question i have is other than the cat hitting the sway bar and it being a tad short. which was no problem cause we just pulled the catback forward.

so if i get a skinny cat like a magnaflow which is only 4" high it will fit and i will have solved the problem?

or should i just get the 200$ dp i saw last night

i dont remember where though.

Last edited by blackbolt89; 06-11-2009 at 02:08 PM. Reason: Automerged Doublepost
Old 06-11-2009, 02:39 PM
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Originally Posted by blackbolt89
BUT its the only DP that will fit a 2.2 auto with no problems.

how big is the LSJ? 2.5?

nvm i found the answer.

but the real question i have is other than the cat hitting the sway bar and it being a tad short. which was no problem cause we just pulled the catback forward.

so if i get a skinny cat like a magnaflow which is only 4" high it will fit and i will have solved the problem?

or should i just get the 200$ dp i saw last night

i dont remember where though.
the lsj downpipe is 2.75" and necks to about 2.50" right before the flange
Old 06-11-2009, 08:04 PM
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i dont understand this.. i have an auto 2.2 and i have aftermarket header/DP combo... i have zero rubbing or anything.. i dont think my car is a freak, because i have a decent amount of clearance..not just a few MM or anything
Old 06-11-2009, 09:01 PM
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Originally Posted by HunterKiller89
i dont understand this.. i have an auto 2.2 and i have aftermarket header/DP combo... i have zero rubbing or anything.. i dont think my car is a freak, because i have a decent amount of clearance..not just a few MM or anything
NONONONONONO

theres no problem with going with AFTERmarkert header and dp's

we're talking about using the LSJ dp. which has a cat thats the size of a human head. its a decent amount bigger than what was on my 2.2 stock. THATS the real problem. cause then the cat sits on the front sway bar when you drive.

aftermarket dps all have other small pod cats or that magnaflow 4" tall high flow. the stock LSJ cat is ******* huge.

heres a link to the XTC dp with the LSJ on the left. look at the cat size compared to an aftermarket high flow. https://www.cobaltss.net/gallery/fil...edownpipes.jpg
Old 06-11-2009, 11:25 PM
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Correct...this thread is about using the LSJ DP on an auto equipped Cobalt (or G5). The LSJ DP is shorter than the auto cobalt DP, and the size of the cat -- with the way the first pipe bend is -- keeps it from being a "bolt-in".
Old 06-11-2009, 11:37 PM
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Originally Posted by Red07SSNA
Correct...this thread is about using the LSJ DP on an auto equipped Cobalt (or G5). The LSJ DP is shorter than the auto cobalt DP, and the size of the cat -- with the way the first pipe bend is -- keeps it from being a "bolt-in".
do you think switching the cat out with a small magnaflow one will solve the problem? or are there more problems than just the cat hitting the sway bar?
Old 06-12-2009, 04:09 PM
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Originally Posted by blackbolt89
do you think switching the cat out with a small magnaflow one will solve the problem? or are there more problems than just the cat hitting the sway bar?
The LSJ cat is a high flow cat that still meets federal emissions requirements and keeps the HO2S -2 sensor happy...switching cats will just provide different problems...the O2 CEL for example.

On my Cobalt the LSJ DP caused the cat back exhaust to be pulled forward enough to make it hit the body -- as well as the Cat resting on the sway bar so I could feel the exhaust as much as I could hear it.
Old 06-12-2009, 04:55 PM
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Why not just weld a 2 inch piece of 2.75" pipe between the flange and the cat so it would extend it away from the swaybar??
Old 06-12-2009, 08:22 PM
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Originally Posted by Chuck
Why not just weld a 2 inch piece of 2.75" pipe between the flange and the cat so it would extend it away from the swaybar??
Initially I did that -- I had a 1.25" length piece of 2 3/4" pipe installed between the manifold flange and the cat...but the bend in the LSJ pipe puts the cat even lower with an extension. I ended up having to take it back and getting it cut apart and rewelded to fit professionally. Now the LSJ DP isn't too low to the ground either.

Here's a clearer shot of how short the LSJ DP is than the LE5 auto DP -- also notice that the first bend on the LSJ DP is near the manifold connector while the first bend is near the Cat on the LE5 DP:
https://www.cobaltss.net/gallery/fil...s_le5_dp_3.jpg

Old 06-12-2009, 10:43 PM
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Originally Posted by Red07SSNA
The LSJ cat is a high flow cat that still meets federal emissions requirements and keeps the HO2S -2 sensor happy...switching cats will just provide different problems...the O2 CEL for example.

On my Cobalt the LSJ DP caused the cat back exhaust to be pulled forward enough to make it hit the body -- as well as the Cat resting on the sway bar so I could feel the exhaust as much as I could hear it.
my rear o2 CEL is deleted to begin with so i dont care. lol

and i hear you on the cat vibe ****. its getting annoying.

you still have it on?
Old 06-13-2009, 08:35 AM
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thats wierd. i just looked at my dp and the cat is about 2" away from the sway bar. cant see how the lsj dp wouldnt fit. seems like theres alot of space there. also the bends above the cat are to the drivers side and not the bottom which makes it look like the whole dp is going to the drivers side a bit and not straight down. i have the xtc dp and pretty soon will be installing it. ill keep you guys posted but i think the xtc dp will bolt on with no problems
Old 06-13-2009, 10:11 AM
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Originally Posted by blackbolt89
my rear o2 CEL is deleted to begin with so i dont care. lol

and i hear you on the cat vibe ****. its getting annoying.

you still have it on?
Yes, I have the LSJ DP on...but remember I had it cut apart and rewelded to make it fit perfect.

Originally Posted by hailcesar75
thats wierd. i just looked at my dp and the cat is about 2" away from the sway bar. cant see how the lsj dp wouldnt fit. seems like theres alot of space there. also the bends above the cat are to the drivers side and not the bottom which makes it look like the whole dp is going to the drivers side a bit and not straight down. i have the xtc dp and pretty soon will be installing it. ill keep you guys posted but i think the xtc dp will bolt on with no problems
It is deceiving...that is exactly what I thought...Hmmm...should just go right in because it looks like it will. It didn't, hence this thread If it just bolted in I would have made a thread titled "LSJ bolts up to the 2.4L auto-equipped Cobalts

Last edited by Red07SSNA; 06-13-2009 at 10:12 AM. Reason: Automerged Doublepost
Old 06-13-2009, 10:14 AM
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Does the xtc dp look the same as the lsj dp?
Old 06-13-2009, 10:19 AM
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Originally Posted by hailcesar75
Does the xtc dp look the same as the lsj dp?
I think you will find that the XTC DP will be shorter than the auto DP -- unless they have been reading this post and made one for the auto. The cats on the aftermarket DPs are smaller and therefore not a problem. On YourCobalt (website) there is a Cobalt owner who had to have his aftermarket DP lengthened because it caused his cat-back to pull forward and hit the body.


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