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Looking to see if anyone or anyone you know has used these and if so what is your option. Curious about any excessive engine sounds and also did it help sound at the tailpipe, having a cam installed so a very quick swap during that process, I have a cat less xpipe currently , not really looking for lt headers vs this opinions just feedback in these items if there is any
I have catlessversion. not much use doing that over stock setup. very loud on cold start not so much after its hot. did the mid pipe as well and have horrible fumes in the cab. welded them hoping it would fix it no luck. went back to oem mid pipe all the fumes are gone. ill try it agin when I go to corn over the winter.
was a huge Pia getting 1 studout of each side from the header. need to loosen the headers and pull them up as far as you can to clear the stud. I like this method for my hp goals since its so much cheaper than headers and more clearance from the starter for the heat than headers
I have catlessversion. not much use doing that over stock setup. very loud on cold start not so much after its hot. did the mid pipe as well and have horrible fumes in the cab. welded them hoping it would fix it no luck. went back to oem mid pipe all the fumes are gone. ill try it agin when I go to corn over the winter.
was a huge Pia getting 1 studout of each side from the header. need to loosen the headers and pull them up as far as you can to clear the stud. I like this method for my hp goals since its so much cheaper than headers and more clearance from the starter for the heat than headers
my potential setup would be stock manifolds then the catted down pipes in the link above and a cat less xpipe then stock mufflers , already have $250 in the xpipe so another $500 for the catted down pipes , should basically be replacing the stock primary cats with the high flow cats from the eos down pipe , quite a bit less than lt headers with high flow cats from arh or others and since exhaust will be off during cam install should be a pretty easy swap.
If you remove your cats, be prepared for some noxious fumes as 9sec mentioned, there is a minimal increase in hp by doing this, it's not worth it
its odd for me I never had this issue with my other cars I modded . once I put the unmonitored cats from the oem mid pipe back on my issue is all but gone. catless downpipes oem mid pipe npp exhaust. for me I mainly wanted a louder exhaust and try to get some of the heat away from critical parts close to the motor.
I am aware of the no cats issue in regards to smell and that was not my plan , I am considering replacing the oem down pipe with the eos down pipe that has high flow cats, and looking for experiences of if it made any difference in the sound of the car both inside the cabin and at the tailpipe , I am aware of the minimal power gain, just looking for a little throatier sound to go along with the stage 1 cam install, I would prefer not to use longtube headers and I already have a catless Xpipe
If your going to get a tune anyway it would give you some more power with long tube headers and a weld in CAT with the catless X pipe.. Loved that sound on my Z51!!
I looked into this as well. The consensus I got was don’t waste your time. I’ll only do it if I end up getting a cam. I have all other air components upgraded except for the exhaust manifold and down pipe.
I looked into this as well. The consensus I got was don’t waste your time. I’ll only do it if I end up getting a cam. I have all other air components upgraded except for the exhaust manifold and down pipe.
interesting, I would not do anything more than my Xpipe if I were not also doing a cam (want some chop and main objective to remove dod) from what I see the stock z06 manifolds look like shorty headers so putting in high flow catted down pipe may add some sound and keep the smell away, but the post above here makes it sound like a set of the Midpipe headers hooked up to my stock Xpipe might be a little more of sound and power for a fraction of the cost of longtube headers. I am sure I could find a buyer for my catless Xpipe, just hate to waste the opportunity to make changes while engine is out ,
I am curious if replacing the stock manifolds with any type of header poses a heat problem in the engine bay??
if emissions aren't an issue sell the mid pipe run catless d/p and oem mid pipe.
I am moving to the setup as you mention you had(have), stock manifold, catless down pipe and oem mid (x) pipe, you mentioned emission issues, I will still have cats so I am not sure if passing emissions in Ohio will be a problem but then again I am not sure what will be the situation with the o2 sensors and how they are addressed with tuning, fo you gave insight on that
I am moving to the setup as you mention you had(have), stock manifold, catless down pipe and oem mid (x) pipe, you mentioned emission issues, I will still have cats so I am not sure if passing emissions in Ohio will be a problem but then again I am not sure what will be the situation with the o2 sensors and how they are addressed with tuning, fo you gave insight on that
if you don’t have primary cats emission tests will be an issue if a visual is done. You can run foulers to get past the computer but not the visual
if you don’t have primary cats emission tests will be an issue if a visual is done. You can run foulers to get past the computer but not the visual
I see , that makes sense, it does look as if the primary are pretty exposed so could be an issue , I just had a check and I recall the guy trying to get something underneath but he may have not been able to due to car being low but he definitely stuck something in the obd port, thanks for the feedback
I see , that makes sense, it does look as if the primary are pretty exposed so could be an issue , I just had a check and I recall the guy trying to get something underneath but he may have not been able to due to car being low but he definitely stuck something in the obd port, thanks for the feedback
typically they run a mirror under the car to see the cats and plug a computer in to the obd to check for faults and codes
typically they run a mirror under the car to see the cats and plug a computer in to the obd to check for faults and codes
gotcha, that is what I recall as well, not sure if the fact secondary are still there would suffice, I think there is an opening in the tunnel plate right under the secondary cats, maybe paint them bright pink with a Arrow on the tunnel saying cats here ? Hah
No reason to replace factory cats with these. LT1 and LT4 (Z06) use the exact same exhaust. Replacing factory cats with these is simply swapping quality factory parts for cheap aftermarket with Zero benefits
it’d be more entertaining to simply light the money on fire.
No reason to replace factory cats with these. LT1 and LT4 (Z06) use the exact same exhaust. Replacing factory cats with these is simply swapping quality factory parts for cheap aftermarket with Zero benefits
it’d be more entertaining to simply light the money on fire.
I am not inclined to burn money as I am also not talking about replacing factory cat down pipes with pipes with aftermarket cats or anything from an lt1, I am not sure where that came from but I will be using down pipes with no cats not aftermarket cats as you assume. There is definitely a difference in an oem pipe with cats vs aftermarket pipes with no cats
my potential setup would be stock manifolds then the catted down pipes in the link above and a cat less xpipe then stock mufflers , already have $250 in the xpipe so another $500 for the catted down pipes , should basically be replacing the stock primary cats with the high flow cats from the eos down pipe , quite a bit less than lt headers with high flow cats from arh or others and since exhaust will be off during cam install should be a pretty easy swap.
Thanks for your input, I appreciate it
Originally Posted by acs3931
I am not inclined to burn money as I am also not talking about replacing factory cat down pipes with pipes with aftermarket cats or anything from an lt1, I am not sure where that came from but I will be using down pipes with no cats not aftermarket cats as you assume. There is definitely a difference in an oem pipe with cats vs aftermarket pipes with no cats
So which one is it? Your post pretty clearly says catted down pipes. Now you say down pipes with no cats.
Regardless, you won't pick up any noticeable hp, if at all. This is not like the old days. The factory cats you'd be replacing or deleting depending on which post is accurate, are sized for the 650hp LT4. In fact....and I have to double check....I believe the same cats are used on the 755hp ZR1.
You would drop about 30 lbs if you go catless so that by definition helps performance but you won't notice it on the street and it's not significant enough to notice on track.
I think I have a pretty good feel for what works and what doesn't.
So which one is it? Your post pretty clearly says catted down pipes. Now you say down pipes with no cats.
Regardless, you won't pick up any noticeable hp, if at all. This is not like the old days. The factory cats you'd be replacing or deleting depending on which post is accurate, are sized for the 650hp LT4. In fact....and I have to double check....I believe the same cats are used on the 755hp ZR1.
You would drop about 30 lbs if you go catless so that by definition helps performance but you won't notice it on the street and it's not significant enough to notice on track.
I think I have a pretty good feel for what works and what doesn't.
yes early in post I was discussing catted pipes but through the course of conversation with a member I switched gears, I apologize for confusing you send any one else, FWIW this post was more about sound than hp which I said several times throughout but I appreciate your opinion and will consider as well,
EOS catted downpipes
