Gutting the third cat?
I was just wondering why it seems the people on this board that want to go down to 2 cats are buying test pipes??? Why don't you just take a BFH and a screwdriver and gut the factory cat???
06-22-2008, 01:18 PM
#4
Suzuka Master
iTrader: (2)
I guess alot of it comes down to selling the car. I wouldn't want to sell a car with a gutted cat, personally. Also, the ATLP test pipe has a larger opening than the cat, and should theoretically flow better than a gutted cat.
06-22-2008, 03:13 PM
#6
Suzuka Master
iTrader: (2)
Originally Posted by TLAdvanced
That makes sense. I thought the ATLP test pipe had the same size inlet as stock, or is that the Megan??
06-22-2008, 03:38 PM
#7
Advanced
Join Date: Apr 2008
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I ask everyone the same thing. Yah the ATLP may be a bit larger in diameter, but If I completely gutted out a factory cat and saw not one bit of noticeable performance gains from removing all that restrictive material, you probably won't see any difference in numbers with the negligible ammount diameter increase from ATLP vs Stock gutted.
Gutted stock cat looks the same as a unmodified cat. No buyer would ever know the difference. Hence why ATLP's allows for the covers to be re-installed.
Gutted stock cat looks the same as a unmodified cat. No buyer would ever know the difference. Hence why ATLP's allows for the covers to be re-installed.
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06-23-2008, 12:40 AM
#9
Suzuka Master
iTrader: (2)
Originally Posted by CBP TL-S
I ask everyone the same thing. Yah the ATLP may be a bit larger in diameter, but If I completely gutted out a factory cat and saw not one bit of noticeable performance gains from removing all that restrictive material, you probably won't see any difference in numbers with the negligible ammount diameter increase from ATLP vs Stock gutted.
Gutted stock cat looks the same as a unmodified cat. No buyer would ever know the difference. Hence why ATLP's allows for the covers to be re-installed.
Gutted stock cat looks the same as a unmodified cat. No buyer would ever know the difference. Hence why ATLP's allows for the covers to be re-installed.
06-23-2008, 03:09 AM
#10
06-23-2008, 04:16 AM
#11
I wanted to say that gutting the cat its not a good idea...First its a damage done permanently second...The J-Pipe has larger diameter and the third and most important thing...Gutting the cat make sure its completely gutted...Do not leave any residue of restrictive components..that actually obstructs the flow of exhaust creating a unsteady and uneven vortex flow...If gutted make sure its all flushed inside as long as you keep your factory j-pipe if you have a atlp j pipe do not gut the cat
07-01-2008, 01:25 PM
#12
Originally Posted by JuamPs 69
I wanted to say that gutting the cat its not a good idea...First its a damage done permanently second...The J-Pipe has larger diameter and the third and most important thing...Gutting the cat make sure its completely gutted...Do not leave any residue of restrictive components..that actually obstructs the flow of exhaust creating a unsteady and uneven vortex flow...If gutted make sure its all flushed inside as long as you keep your factory j-pipe if you have a atlp j pipe do not gut the cat
07-02-2008, 10:26 AM
#14
I think they were just suggesting that the round opening in the cat is a bit smaller than the exit from the J-Pipe. Truth is, I think the entrance losses from this mismatch in size are still less than the flow loss caused by the restriction from the catalytic converter cells.
Do it if you want. Just make real sure you have completely cleared it out and removed all debris. Personally, I didn't think the effort was worth it, so I got the ATLP race pipe along with the J-Pipe.
Do it if you want. Just make real sure you have completely cleared it out and removed all debris. Personally, I didn't think the effort was worth it, so I got the ATLP race pipe along with the J-Pipe.
07-02-2008, 07:30 PM
#18
Team Owner
I'm the one that has put mine on the rollers to prove it will still pass without the 3rd cat.
Knowing that, why would you ever want to put it back to stock?
If you would never put it back to stock, why pay $100+ for a test pipe?
If you got caught, you're in much better shape with a gutted stock cat than a test pipe with shield. Cats occasionally come apart and blow out of the exhaust, that would be your get out of jail ticket. In CA they can take your car away for intentionally deleting a cat.
After doing this mod, I would not do it again unless I had a supercharger or other serious airflow mods.
The only reason I regret gutting my stock cat so soon is I have to pass smog in the GN and I was going to use it for that.
Knowing that, why would you ever want to put it back to stock?
If you would never put it back to stock, why pay $100+ for a test pipe?
If you got caught, you're in much better shape with a gutted stock cat than a test pipe with shield. Cats occasionally come apart and blow out of the exhaust, that would be your get out of jail ticket. In CA they can take your car away for intentionally deleting a cat.
After doing this mod, I would not do it again unless I had a supercharger or other serious airflow mods.
The only reason I regret gutting my stock cat so soon is I have to pass smog in the GN and I was going to use it for that.
07-02-2008, 08:13 PM
#20
Team Owner
Originally Posted by subinf
I second the "oem cats are expensive" line of reasoning.
07-02-2008, 09:32 PM
#21
07-02-2008, 11:25 PM
#22
dont forget. cats, are made of platinum.. so you are wasting it..
like others said.. destroying a $300+ piece of equipment, when you can get a $90 one, and re-sell it for like 50 or 60 bucks when you are done, and still have the $300+ one
Also, yes, aftermarket ones (ATLP & i think RV6 (richie)) are 2.5" inlet/outlet
also, you can sell a hi-flo 600 cell/in type-s cat to a base tl owner, for probably... like 150-200 or so... brand new cats are over $300+
i would do a test pipe, but im gonna be running pre-cat deletes... so.. i need to be a little considerate of the environment, not gonna run fully cat-less
like others said.. destroying a $300+ piece of equipment, when you can get a $90 one, and re-sell it for like 50 or 60 bucks when you are done, and still have the $300+ one
Also, yes, aftermarket ones (ATLP & i think RV6 (richie)) are 2.5" inlet/outlet
also, you can sell a hi-flo 600 cell/in type-s cat to a base tl owner, for probably... like 150-200 or so... brand new cats are over $300+
i would do a test pipe, but im gonna be running pre-cat deletes... so.. i need to be a little considerate of the environment, not gonna run fully cat-less
07-03-2008, 12:24 AM
#23
Originally Posted by BLACKURA_NY
dont forget. cats, are made of platinum.. so you are wasting it..
like others said.. destroying a $300+ piece of equipment, when you can get a $90 one, and re-sell it for like 50 or 60 bucks when you are done, and still have the $300+ one
Also, yes, aftermarket ones (ATLP & i think RV6 (richie)) are 2.5" inlet/outlet
also, you can sell a hi-flo 600 cell/in type-s cat to a base tl owner, for probably... like 150-200 or so... brand new cats are over $300+
i would do a test pipe, but im gonna be running pre-cat deletes... so.. i need to be a little considerate of the environment, not gonna run fully cat-less
like others said.. destroying a $300+ piece of equipment, when you can get a $90 one, and re-sell it for like 50 or 60 bucks when you are done, and still have the $300+ one
Also, yes, aftermarket ones (ATLP & i think RV6 (richie)) are 2.5" inlet/outlet
also, you can sell a hi-flo 600 cell/in type-s cat to a base tl owner, for probably... like 150-200 or so... brand new cats are over $300+
i would do a test pipe, but im gonna be running pre-cat deletes... so.. i need to be a little considerate of the environment, not gonna run fully cat-less
I'll post in the BM if I choose 2 sell it!
07-03-2008, 04:04 AM
#25
Originally Posted by BLACKURA_NY
dont forget. cats, are made of platinum.. so you are wasting it..
like others said.. destroying a $300+ piece of equipment, when you can get a $90 one, and re-sell it for like 50 or 60 bucks when you are done, and still have the $300+ one
Also, yes, aftermarket ones (ATLP & i think RV6 (richie)) are 2.5" inlet/outlet
also, you can sell a hi-flo 600 cell/in type-s cat to a base tl owner, for probably... like 150-200 or so... brand new cats are over $300+
i would do a test pipe, but im gonna be running pre-cat deletes... so.. i need to be a little considerate of the environment, not gonna run fully cat-less
like others said.. destroying a $300+ piece of equipment, when you can get a $90 one, and re-sell it for like 50 or 60 bucks when you are done, and still have the $300+ one
Also, yes, aftermarket ones (ATLP & i think RV6 (richie)) are 2.5" inlet/outlet
also, you can sell a hi-flo 600 cell/in type-s cat to a base tl owner, for probably... like 150-200 or so... brand new cats are over $300+
i would do a test pipe, but im gonna be running pre-cat deletes... so.. i need to be a little considerate of the environment, not gonna run fully cat-less
07-03-2008, 06:18 PM
#26
One on the right for me
Originally Posted by I hate cars
If it makes you feel better having that expensive stock convertor taking up space in the garage, go for it. There is no reason to ever put it back on.
And the cat fits in a shoe box, not sure about it taking up space. But maybe if you don't have a garage???
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