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Exhaust
- Thread starter c.morales
- Start date
Tourige
CEG's Resident Jackass
Did you even bother searching?
BlackE1
Veteran CEG'er
Or you could try to help a little, gutting pre cats, or headers is your options.
TheMexicanJob
Banned?
Gutting is easy and cheap, but gains are mainly just for sound, i've never heard of anyone gutting the precats and getting really notciable amounts, but i don't know/think anyone that has dyno tested.
RawBurt
Hard-core CEG'er
I didn't notice any crazy sound gains when I gutted mine back in the day... FTR
BlackE1
Veteran CEG'er
Correct me if I am wrong but gutting your precats removes the huge restriction of the catalyst and honeycomb structure. Opening up two major restrictions in your exhaust. I would assume you would get some gain. I noticed a difference when I installed my headers. I know headers aren’t a great comparison but there has to be some what of a performance increase due to the removed restriction.
Correct me if I am wrong but gutting your precats removes the huge restriction of the catalyst and honeycomb structure. Opening up two major restrictions in your exhaust. I would assume you would get some gain. I noticed a difference when I installed my headers. I know headers aren’t a great comparison but there has to be some what of a performance increase due to the removed restriction.
yes and no ... you need exhaust velocity and when you remove the cat material you leave a big open hole that will slow cause bad exhaust gas flow ... headers remove the resitriction but don't open up to slow exhaust flow ...
posthuman63t
Veteran CEG'er
Based on everything I have read on the boards...
Gutting your pre-cats really doesn't add power unless they are clogged or not working at maximum efficiency(sp?).
Basically, some people notice small gains because theirs are clogged, but to say they flow as well (or even half as well) as headers is rediculus IMO.
Gutting your pre-cats really doesn't add power unless they are clogged or not working at maximum efficiency(sp?).
Basically, some people notice small gains because theirs are clogged, but to say they flow as well (or even half as well) as headers is rediculus IMO.
BlackE1
Veteran CEG'er
Based on everything I have read on the boards...
Gutting your pre-cats really doesn't add power unless they are clogged or not working at maximum efficiency(sp?).
Basically, some people notice small gains because theirs are clogged, but to say they flow as well (or even half as well) as headers is rediculus IMO.
This is not what I was getting at in my post.
posthuman63t
Veteran CEG'er
I know what your getting at in your post. Which is that there "has to be" some gain by removing the honeycomb material in the precats because it is "blocking" flow.
My post still stands, being that you'd think you'd gain something but the results that I've read on here, seem to say that the gutting only adds power if you were lacking because of clogged pre-cats.
Remember that it has been shown that removing the main cat on an svt has shown a power decrease when replaced with straight pipe. You would think it would flow better because of less of a restriction, but thats not what happened. In theory your post makes sense, when applied though, there are mixed results.
My post still stands, being that you'd think you'd gain something but the results that I've read on here, seem to say that the gutting only adds power if you were lacking because of clogged pre-cats.
Remember that it has been shown that removing the main cat on an svt has shown a power decrease when replaced with straight pipe. You would think it would flow better because of less of a restriction, but thats not what happened. In theory your post makes sense, when applied though, there are mixed results.
TourDeForce
Hard-core CEG'er
Correct me if I am wrong but gutting your precats removes the huge restriction of the catalyst and honeycomb structure. Opening up two major restrictions in your exhaust. I would assume you would get some gain. I noticed a difference when I installed my headers. I know headers aren’t a great comparison but there has to be some what of a performance increase due to the removed restriction.
The restriction from modern catalyst material is minimal, you can look right through it. It's like a bundle of straws, very little restriction of airflow. When you gut the precats you have now opened up that 'chamber' that the cats were in. That big, open hole creates turbulance and slows the exhaust pulses down - a lot.
There are no gains to be had from gutting, I've done it twice. The sound is almost the same - not a noticable difference unless you're looking for it. If you want performance or sound increases, header set is your choice. Period.