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Old 09-24-2008, 03:30 AM   #1 (permalink)
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Magnaflow or RT Cat?
Hi guys,

I am new to modifying for performance so i need as many tips as i can get

At the moment, I have ordered topspeed headers, NST pulleys and have a comptech icebox. To complement the headers, i was thinking about an aftermarket cat. BTW i will be sticking to stock oem cat back.

Of the two cats, Magnaflow and RT, which is quieter?
Whats the advantage or disadvantage of either of them?

With the CEL problem, does that exist with both brands?
What causes the problem and how do i get about fixing it?

What are the model numbers for each of them and where to buy?
Lastly, what else do i need to buy besides the cats themselves in order to fit.

thanks guys! I know thats alot of questions but i have been reading the threads about cats and the more i read the more confused i got

cheers!
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Old 09-24-2008, 03:47 AM   #2 (permalink)
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All I know is magnaflow is quieter (it has a higher cell count than rt) and I don't think it has the cel problem. I think that was only for the rt, but I am not 100% sure.
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Old 09-24-2008, 03:52 AM   #3 (permalink)
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^ thanks for that tsxtasy, much appreciated!

Any one else have any opinions?
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Old 09-24-2008, 03:59 PM   #4 (permalink)
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The Magnaflow would have to be a custom job where as the RT is a bolt on. I had a Magnaflow on my old Si and it flowed good, but it eventually produced a rattle from the heat shield. I'd just go with the RT, it's a nice piece and has a higher cell count as mentioned above.
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Old 09-24-2008, 05:23 PM   #5 (permalink)
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I dont know anything about the Magnaflow but I got the RT and its great so far no problems yet... easy to install no hassle.
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Old 09-24-2008, 05:44 PM   #6 (permalink)
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Quote:
Originally Posted by tsxtasy View Post
All I know is magnaflow is quieter (it has a higher cell count than rt) and I don't think it has the cel problem. I think that was only for the rt, but I am not 100% sure.
Magnaflow is a tad quieter than RT, but probably due to the cells 300 vs 200. Both might OR might not have CEL problem, even the defouler is used.

RT has better built quality, directly bolt-on, and twice the price of Magnaflow.
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Old 09-24-2008, 06:01 PM   #7 (permalink)
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I have heard that the RT can make an exhaust sound raspy at high rpm? Anyone have this problem?
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Old 09-24-2008, 06:44 PM   #8 (permalink)
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I have heard that the RT can make an exhaust sound raspy at high rpm? Anyone have this problem?
Most HFC does that on 4 cylinder.
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Old 09-24-2008, 08:56 PM   #9 (permalink)
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Interesting how most people have commented that magnaflow is 300cell. It could be a new release but im not sure, the one i found on ebay is 200cell. I cant justify the 3-4x price increase for the RT.

What size should i be ordering? I ordered the 2.5" to be safe considering the header outpipe is 2", am i right in thinking so? Or should i have gone 2.25" or even 3"(as a member on acura**** did)?

Here is the cat if anyone wants to check it out.

http://cgi.ebay.com.au/magnaflow-2-1...QQcmdZViewItem
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Old 09-24-2008, 10:39 PM   #10 (permalink)
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Quote:
Originally Posted by snYpz View Post
Interesting how most people have commented that magnaflow is 300cell. It could be a new release but im not sure, the one i found on ebay is 200cell. I cant justify the 3-4x price increase for the RT.

What size should i be ordering? I ordered the 2.5" to be safe considering the header outpipe is 2", am i right in thinking so? Or should i have gone 2.25" or even 3"(as a member on acura**** did)?

Here is the cat if anyone wants to check it out.

http://cgi.ebay.com.au/magnaflow-2-1...QQcmdZViewItem
I'm not sure about that, send the model # to Magnaflow directly and look for their reply.

Another issue for the cat above is, it MIGHT not for OBD-II vehicle, simple there's NO O2 port in it. Of course, you can custom drill it.

What header do you have? It doesn't really matter what size the CAT is, because when you install it, the exhaust shop will weld a pipe on both end to connect one end to the header, and the other end to Cat-back exhaust. I think a 2.25" will be good.
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Old 09-24-2008, 10:57 PM   #11 (permalink)
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Thanks Chuson!

I thought all the Magnaflows didnt have an O2 port and needed to be welded in somehow?
What would be the signifance of having it OBD II?

I have the Topspeed header on order and i think its a 2" end pipe.
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Old 09-25-2008, 01:16 AM   #12 (permalink)
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If you dont have smog checking have you thought about a testpipe? I have a T1R testpipe and I noticed a huge difference on the dyno, the sound of it with the stock exhaust sounded really good. Aftermarket cats are a slightly noticable increase in performance but testpipes are a night and day difference, no CEL's either.
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Old 09-25-2008, 01:34 AM   #13 (permalink)
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If you dont have smog checking have you thought about a testpipe? I have a T1R testpipe and I noticed a huge difference on the dyno, the sound of it with the stock exhaust sounded really good. Aftermarket cats are a slightly noticable increase in performance but testpipes are a night and day difference, no CEL's either.
so testpipe>rt cat for performance?
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Old 09-25-2008, 01:35 AM   #14 (permalink)
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testpipe > any cat for performance, just make sure you dont have smog testing because it will fail
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Old 09-25-2008, 01:37 AM   #15 (permalink)
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testpipe > any cat for performance, just make sure you dont have smog testing because it will fail
well i just got my smog tested last month so i got 2 years until the next test... haha but now that makes me wanna go and get a test pipe.
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