ATLP High-Flow Metallic Catalyst
ATLP High-Flow Metallic Catalyst
The 3rd cat on the TL was designed to be used with the stock exhaust system and stock J-Pipe. When upgrading to an aftermarket exhaust system, the larger piping diameter is still limited by the factory 3rd cat, which has a 2.25” diameter that causes a restriction on exhaust flow, and subsequently limits exhaust performance gains.
The ATLP High-Flow 3rd Cat utilizes a high-flow/high-volume 200-cell metallic catalyst that is a direct OE replacement. It features an ultra-smooth tapered design to retain maximum velocity through the entire converter. The cross section is also increased by 12% over OE to a 2.5” diameter. Tapered design also increases overall volume over the factory unit.
The design of the cats also allows the use of the factory heat shield to retain a factory look and keep the cat protected.
In stock now!And for a limited time only free shipping and handling!
ATLP High-Flow Catalyst
The ATLP High-Flow 3rd Cat utilizes a high-flow/high-volume 200-cell metallic catalyst that is a direct OE replacement. It features an ultra-smooth tapered design to retain maximum velocity through the entire converter. The cross section is also increased by 12% over OE to a 2.5” diameter. Tapered design also increases overall volume over the factory unit.
The design of the cats also allows the use of the factory heat shield to retain a factory look and keep the cat protected.
In stock now!And for a limited time only free shipping and handling!
ATLP High-Flow Catalyst
Nice looking product!
This is my question. So the cells turn the turbulent flow of exhaust from the J pipe into a more laminar flow... however, it still has to travel to the exit of the tips and the flow won't stay completely laminar. Also, don't the cells reduce the cross sectional area of the flow? How does this improve performance? The length of the 3rd cat isn't very long at all and doesn't seem like it'll affect the flow, positively or negatively. Is this much better than a straight run of pipe with no restrictions? Do you happen to have dyno numbers yet comparing this and your race pipe?
Sorry. I'm new to this...
This is my question. So the cells turn the turbulent flow of exhaust from the J pipe into a more laminar flow... however, it still has to travel to the exit of the tips and the flow won't stay completely laminar. Also, don't the cells reduce the cross sectional area of the flow? How does this improve performance? The length of the 3rd cat isn't very long at all and doesn't seem like it'll affect the flow, positively or negatively. Is this much better than a straight run of pipe with no restrictions? Do you happen to have dyno numbers yet comparing this and your race pipe?
Sorry. I'm new to this...
The point of the substrate isn't necessarily to produce a laminar flow, but rather a more porous design, so that the exhaust pulses can flow through without losing much of their velocity. A higher velocity helps assist cylinder scavenging (which equates to a fresher and more powerful combustion). The tapered construction of the shell also is there to maintain the most velocity out of the engine. Increasing or maintaining the velocity is important especially if your not boosted.
The third OE cat also is restrictive due to it's diameter sizing, at 2.25" it bottlenecks performance especially if you have changed out the exhaust, or the J-Pipe as they are both almost always at 2.5" diameter.
This flows very similar to the straight through Race Pipe, maybe a hair less, but not by a large margin at all. The substrate is a high flow performance make, and you can see pretty much through it. I'd say the difference is probably 1hp, it that. The beauty is that it does still uses a cat, instead of deleting it entirely.
The third OE cat also is restrictive due to it's diameter sizing, at 2.25" it bottlenecks performance especially if you have changed out the exhaust, or the J-Pipe as they are both almost always at 2.5" diameter.
This flows very similar to the straight through Race Pipe, maybe a hair less, but not by a large margin at all. The substrate is a high flow performance make, and you can see pretty much through it. I'd say the difference is probably 1hp, it that. The beauty is that it does still uses a cat, instead of deleting it entirely.
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quick noob question...just ordered hi-flow cat and j pipe but won't have the j pipe for a while. should i wait to put cat on with j pipe or will it not hurt to put cat on now? im running XLR8 resonated exhaust and AEM CAI right now? thanks for the help in advance
aznbo may know: does this work/fit for the 2G RL's?
The Race pipe will obviously flow better. It's straight through, no restrictions. It will also be a little louder, in comparison to the Metal Cat. But, the metal cat is extremely free flowing for a 300 cell count...you can pretty much blow through it and feel it on the other end. Also, you won't have to worry about emissions and the increased noise with the metal cat pipe.
If your running with factory/catted primary converters, the race pipe would be a better application. If you have the pre-cat deletes, I'd suggest going with the metal cat.
1999 TL
Joined: Jun 2008
Posts: 59
Likes: 0
From: Dallas, Texas
Three quick questions:
1) Would this work for a 1999 TL-P?
2) If so, how does it measure up to the (cheaper) Random Technology High Flow Cat?
3) I have XS headers in, do I need the J-pipe? Does it provide additional gains? The rest of my exhaust setup is stock other than the headers...
Sorry for being a noob.
Thanks!
1) Would this work for a 1999 TL-P?
2) If so, how does it measure up to the (cheaper) Random Technology High Flow Cat?
3) I have XS headers in, do I need the J-pipe? Does it provide additional gains? The rest of my exhaust setup is stock other than the headers...
Sorry for being a noob.
Thanks!
Advanced
Joined: Jul 2007
Posts: 82
Likes: 0
From: Monroe
The point of the substrate isn't necessarily to produce a laminar flow, but rather a more porous design, so that the exhaust pulses can flow through without losing much of their velocity. A higher velocity helps assist cylinder scavenging (which equates to a fresher and more powerful combustion). The tapered construction of the shell also is there to maintain the most velocity out of the engine. Increasing or maintaining the velocity is important especially if your not boosted.
The third OE cat also is restrictive due to it's diameter sizing, at 2.25" it bottlenecks performance especially if you have changed out the exhaust, or the J-Pipe as they are both almost always at 2.5" diameter.
This flows very similar to the straight through Race Pipe, maybe a hair less, but not by a large margin at all. The substrate is a high flow performance make, and you can see pretty much through it. I'd say the difference is probably 1hp, it that. The beauty is that it does still uses a cat, instead of deleting it entirely.
The third OE cat also is restrictive due to it's diameter sizing, at 2.25" it bottlenecks performance especially if you have changed out the exhaust, or the J-Pipe as they are both almost always at 2.5" diameter.
This flows very similar to the straight through Race Pipe, maybe a hair less, but not by a large margin at all. The substrate is a high flow performance make, and you can see pretty much through it. I'd say the difference is probably 1hp, it that. The beauty is that it does still uses a cat, instead of deleting it entirely.
Question...so, what would be the complete setup? new J-pipe, then straight pipe till the 3rd cat? then that would be replaced by this part? am I mistaken. Then i guess the next thing would be headers right?
Pre-cats, to the J-Pipe, to the 3rd Cat (which is either stock, Hi-Flow, or Race Pipe), and then directly to the cat-back exhaust. It's either the straight pipe, or the high-flow cat, you can't have both as they are both the same part but have different features.
We have been looking into it for the past 3 months, and will start on it soon.
Yes, it will work with all your stock components, as it's designed to work just like the stock unit. You can keep your stock exhaust components, but will gain more when switching it out to an aftermarket J-Pipe, and/or exhaust of course.
I also have one question. Does it fits my stock exhaust if I put on J-pipe and hi-flow? I have TL Type-S 08.
