Replacing stock Cats with new high flow cats?
#1
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Replacing stock Cats with new high flow cats?
i just got a custom exhaust from the end of the stock cats to the mufflers. 2 1/4 piping with magnaflow 14829 mufflers and a custom X-pipe. I want more sound and flow, so what aftermarket high flow cats should i get?
#3
Lexus Test Driver
How much does it cost to remove resonators, and how many shops would actually do it?
#4
Lexus Champion
Originally Posted by MikeSC400
i just got a custom exhaust from the end of the stock cats to the mufflers. 2 1/4 piping with magnaflow 14829 mufflers and a custom X-pipe. I want more sound and flow, so what aftermarket high flow cats should i get?
with 3inch in diameter
#5
Lexus Champion
Originally Posted by NYLexSC
How much does it cost to remove resonators, and how many shops would actually do it?
you can actually remove resonators but it will sound too loud........that is your preference.
i would replace the stock resonators with high flow mufflers instead....just to quiet down a bit.
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The stock sc400 cats flow pretty well (410 cfm on the later models anyway), and quiet things down a lot. You have a couple options for higher-flow cats but some fabbing of brackets, etc may be required.
Random CAT # 702500 flow = 483 CFM (Random Tech Metal Substrate CATS model # 702550)
Magnaflow hi-flow Cat: http://www.car-sound.com/catalog/af_...ehicleID=42770
But like folks said, the true choke points are the stock exhaust manifolds and the resonators (if you haven't already removed them).
Random CAT # 702500 flow = 483 CFM (Random Tech Metal Substrate CATS model # 702550)
Magnaflow hi-flow Cat: http://www.car-sound.com/catalog/af_...ehicleID=42770
But like folks said, the true choke points are the stock exhaust manifolds and the resonators (if you haven't already removed them).
Last edited by broman; 12-20-05 at 03:33 PM.
#7
Super Moderator
I an RX300 owner and I had to get rid of my two precats and main cat...replaced with one Maganflow Cat and no problems or even CELs. Removing the resonator (I have done this) will make it ungodly loud.
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#8
Originally Posted by NYLexSC
How much does it cost to remove resonators, and how many shops would actually do it?
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magnaflow high flow cats
im looking at the magnaflow site someone sent, and i was looking at the 91000 series. should i get the 91000 with or without the hole for the O2 sensor. the sc400 has a sensor in the cats right? so wouldnt getting a O2 sensor hole already on the cat make sense?
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Cat question
So did you find out which ones you needed? The ones with or without the hole for the O2 sensor. I'm thinking about replacing my cats also since I'm redoing my exhaust. Send me a PM or post s reply. Thanks.
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ok, i dont think the information was presented correctly. I already got a custom 2.25" exhaust w/ custom 2.25 X-pipe out to magnaflow mufflers. I dont have any resonators. I only have the front stock 2 cats that come straight outta the manifold.i got the exhaust done from the end of the stock front cats all the way back. i want to replace them to get more sound and flow. i was wondering which ones i should get. im looking at the 91000 seres and the 94000 series. i kno their is a sensor in cat's so i was wondering if i should get a cat with a built in sensor, or does it not matter if their is a hole for the sensor or not? i wanted to see if anyone had replaced their front 2 cat's with high flows and the exact cat's they purchased.
#13
EV ftw!!!
Originally Posted by MikeSC400
ok, i dont think the information was presented correctly. I already got a custom 2.25" exhaust w/ custom 2.25 X-pipe out to magnaflow mufflers. I dont have any resonators. I only have the front stock 2 cats that come straight outta the manifold.i got the exhaust done from the end of the stock front cats all the way back. i want to replace them to get more sound and flow. i was wondering which ones i should get. im looking at the 91000 seres and the 94000 series. i kno their is a sensor in cat's so i was wondering if i should get a cat with a built in sensor, or does it not matter if their is a hole for the sensor or not? i wanted to see if anyone had replaced their front 2 cat's with high flows and the exact cat's they purchased.
So with the resonators removed your exhaust is still not loud enough for you? From all I have heard (video clips) and read here on CL, removing the resonators makes the exhaust very loud - so I don't understand what you mean by saying that your's is not loud enough.
What is the sound like right now? Does it sound like one of those modified Mustangs? Better yet, can you please take a video clip and post it up so that we can hear what your car sounds like? I can host the clip for you if you have problems uploading it.
Last edited by Hameed; 03-13-06 at 12:03 PM.
#14
Originally Posted by Hameed
I find this very interesting because this is exactly what I plan to do (everything you have done so far other than touching the first set of cats).
So with the resonators removed your exhaust is still not loud enough for you? From all I have heard (video clips) and read here on CL, removing the resonators makes the exhaust very loud - so I don't understand what you mean by saying that your's is not loud enough.
What is the sound like right now? Does it sound like one of those modified Mustangs? Better yet, can you please take a video clip and post it up so that we can hear what your car sounds like? I can host the clip for you if you have problems uploading it.
So with the resonators removed your exhaust is still not loud enough for you? From all I have heard (video clips) and read here on CL, removing the resonators makes the exhaust very loud - so I don't understand what you mean by saying that your's is not loud enough.
What is the sound like right now? Does it sound like one of those modified Mustangs? Better yet, can you please take a video clip and post it up so that we can hear what your car sounds like? I can host the clip for you if you have problems uploading it.
I too, will try to post a sound clip for guys when I get home tonight.
#15
EV ftw!!!
Originally Posted by SWSC400
I just did the same exact setup as Mike did last week and I like it, but I too and the exhaust guy were both surpised it wasn't louder? I was almost thinking I could have gone with the 14851 race series instead. These would flow more and be louder as they are not necked down like the 14829's. But hey, I'm old school, my first car was a '68 GTO 400 ci V-8 with headers and cherry bombs that ended under the front seat, now that's my idea of LOUD
I too, will try to post a sound clip for guys when I get home tonight.
I too, will try to post a sound clip for guys when I get home tonight.
How do both of your cars compare to that? Remember to turn up the speaker volume. It sounds so awesome!!!!