Anyone hollow out their cats
#1
Rookie
Thread Starter
Anyone hollow out their cats
Im going to replace my exhaust manifold gaskets this weekend. and i was thining about hollowing out my cats, they already dont work and i have o2 extenders.
just wondering if anyone has removed all the honeycomb stuff inside and if they have and tips or trick to do it?
Thanks!!!
just wondering if anyone has removed all the honeycomb stuff inside and if they have and tips or trick to do it?
Thanks!!!
#2
Yes, I did on another cars.
In my experience, I can tell you few things right away:
- it's not difficult to break inner stuff into pieces and shake it out. Pinch point crowbar well with this.
- without installing a spark arresters in place of cats you exhaust will sound rattling.
- without installing a spark arresters in place of cats you downpipe resonators and mufflers will quickly rust and burn holes.
But the problem is that there are no original spark arresters.
All universal aftermarket one require a lot of work to fit them into a place and weld them on the pipes.
Something like this: , but you need to match the ID on the inlet and outlet with original cats.
So the general idea - they need to be installed as close as possible to the place of the original cats.
As I did on the other cars, the original cats were cut off and then spark arrestors welded in the same place with a lot of efforts and swears.
You need a good muffler shop to do that.
In my experience, I can tell you few things right away:
- it's not difficult to break inner stuff into pieces and shake it out. Pinch point crowbar well with this.
- without installing a spark arresters in place of cats you exhaust will sound rattling.
- without installing a spark arresters in place of cats you downpipe resonators and mufflers will quickly rust and burn holes.
But the problem is that there are no original spark arresters.
All universal aftermarket one require a lot of work to fit them into a place and weld them on the pipes.
Something like this: , but you need to match the ID on the inlet and outlet with original cats.
So the general idea - they need to be installed as close as possible to the place of the original cats.
As I did on the other cars, the original cats were cut off and then spark arrestors welded in the same place with a lot of efforts and swears.
You need a good muffler shop to do that.
#4
~20 y.o. cats won't do anything good for the car.
But we are not discussing this issue here, but a technical possibility.
It will do some bad things by restricting the flow of the exhaust gases and limiting the engine power.
But we are not discussing this issue here, but a technical possibility.
It will do some bad things by restricting the flow of the exhaust gases and limiting the engine power.
#5
Rookie
Thread Starter
Yes, I did on another cars.
In my experience, I can tell you few things right away:
- it's not difficult to break inner stuff into pieces and shake it out. Pinch point crowbar well with this.
- without installing a spark arresters in place of cats you exhaust will sound rattling.
- without installing a spark arresters in place of cats you downpipe resonators and mufflers will quickly rust and burn holes.
But the problem is that there are no original spark arresters.
All universal aftermarket one require a lot of work to fit them into a place and weld them on the pipes.
Something like this: Walker Heavy Duty Spark Arrestor, but you need to match the ID on the inlet and outlet with original cats.
So the general idea - they need to be installed as close as possible to the place of the original cats.
As I did on the other cars, the original cats were cut off and then spark arrestors welded in the same place with a lot of efforts and swears.
You need a good muffler shop to do that.
In my experience, I can tell you few things right away:
- it's not difficult to break inner stuff into pieces and shake it out. Pinch point crowbar well with this.
- without installing a spark arresters in place of cats you exhaust will sound rattling.
- without installing a spark arresters in place of cats you downpipe resonators and mufflers will quickly rust and burn holes.
But the problem is that there are no original spark arresters.
All universal aftermarket one require a lot of work to fit them into a place and weld them on the pipes.
Something like this: Walker Heavy Duty Spark Arrestor, but you need to match the ID on the inlet and outlet with original cats.
So the general idea - they need to be installed as close as possible to the place of the original cats.
As I did on the other cars, the original cats were cut off and then spark arrestors welded in the same place with a lot of efforts and swears.
You need a good muffler shop to do that.
#6
I don't know how hard it to break it to a pieces on this car.
I did it before on the another toyota car, and it was piece of cake.
What you mean you have no mufflers?
Is it straight pipes?
I did it before on the another toyota car, and it was piece of cake.
What you mean you have no mufflers?
Is it straight pipes?
#7
Rookie
Thread Starter
I just have the mufflers unbolted so the exhaust ends right after the rear axle.
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#8
But you still have middle cat. converter (#3) and two resonators.
I talked about them before, that they will go bad much faster after cats hollowing, because the sparks and temperature increase.
I talked about them before, that they will go bad much faster after cats hollowing, because the sparks and temperature increase.
#9
Driver School Candidate
I too am thinking about hollowing out my two upper cats and deleting the third. I want to get headers and have the extra flow. Is there a stainless steel exhaust option that will help slow down the corrosion effects? Also, if the cats are hollowed out will it throw a code or cause any adverse o2 sensing ?
#12
Former Sponsor
Aside from the legal aspects, we do not recommend doing this because the big open chamber creates drone/vibration and causes the exhaust to cool and lose velocity.
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