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  #1 (permalink)  
Old 02-06-2008, 01:12 AM
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high flow cat

im goin to get an ebay test pipe or high flow cat. im pretty sure i read that it will throw a cel because of the o2 sensor. what do i do to bypass that so i can still tell when somethin is wrong with my engine other then the o2. unless im incorrect and it wont throw a code.
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Old 02-06-2008, 03:17 AM
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Get a high flow cat. There will be no difference until you build your boosted engine, and until then running a test pipe will give you a nice ricey exhaust note. Not to mention being even more harmful to the environment.
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Old 02-06-2008, 11:33 AM
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the difference between a good high flow cat and a test pipe is............ 1 hp. stick with the high flow cat.
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Old 02-06-2008, 06:00 PM
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alright. either way i was gonna buy one, i dont wanna make my own crap. so i will prlly get the megan cat
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Old 02-06-2008, 10:12 PM
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No.
Megan is a resonated test pipe, useless.

Get a carsound or magnaflow highflow cat.
www.kteller.com has decent priced cats.
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Old 02-06-2008, 10:39 PM
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high flow cat would still fail emissions right?
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Old 02-06-2008, 10:43 PM
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i dont think it will. you could get it inspected where they dont run emissions. i know a lot of little garages dont run emissions, or just pay someone $50 to just write you up a pink slip.
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Old 02-06-2008, 10:49 PM
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i have a feelin i'm gonna have to do that, they prolly wont like the turbo under the hood either. ha
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Old 02-06-2008, 10:49 PM
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Why would a high flow cat fail emissions? It does the exact same function, more efficiently and with less pressure drop across the biscuit. (The inside of the cat is called a biscuit so I'm told)

SO unless you fail for a car running better than it was from the factory you should be right.
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Old 02-06-2008, 10:54 PM
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you are probally right with the turbo under the hood, but its worth the small price to pay for the hp output.
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Old 02-06-2008, 11:04 PM
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so a test pipe will fail it then lol. it says for off road use only. wouldnt that mean it would be illegal?

and by the 1hp gain, do you mean a test pipe is a little better or the high flow cat is a little better?

im thrilled to find out it wont throw a cel. im gonna get one soon then. maybe it was one of my retard friends that told me that
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Old 02-07-2008, 12:08 AM
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There is a way to prevent the cel from coming on if the high flow doesn't.
Buy a couple "spark plug anti-foul" plugs, drill one large enough to fit the end of the o2 sensor into it, screw the other one onto that one, then screw the whole assembly into your bung (o2 hole).
This pulls the sensor out of the flow path enough that it reads enough of a o2 change that the ecu is happy.
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Old 02-07-2008, 03:01 AM
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Quote:
Originally Posted by ninety3lude View Post

and by the 1hp gain, do you mean a test pipe is a little better or the high flow cat is a little better?
Does it matter? Do you really think that 1HP (probably less by the time it reaches your wheels) will make the difference between :second: and

But the 1HP would be in favour of the test pipe.
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Old 02-07-2008, 11:55 AM
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^^^ lol good one c. yes, the 1 hp is in favor of the test pipe.
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Old 02-08-2008, 01:53 AM
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lol im really not that concerned with hp(i still plan to go with the high flow cat). i was just curious. what do you guys think as far as better sounding. im sure they are close. but the main reason i am gettin this is so its just a touch louder and of course the hp is pretty good for a small price.
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Old 02-08-2008, 10:26 AM
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Let me add that the test pipe will make the exhaust annoyingly loud and raspy. It also chokes the person behind you. I never realized how bad it was until I sold my 4th gen and was riding behind the guy in traffic.

High-flow cat is what ya need though. You pass emissions, keep a nice exhaust, don't kill the environment, and don't choke the people behind you.
Like I said, Carsound or Magnaflow.
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Old 02-08-2008, 11:34 AM
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But what about Random Tech? Don't forget those. I have one...but havent installed it yet. Hopefully this weekend.
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Old 02-08-2008, 11:57 AM
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Quote:
Originally Posted by Brash22 View Post
Why would a high flow cat fail emissions? It does the exact same function, more efficiently and with less pressure drop across the biscuit. (The inside of the cat is called a biscuit so I'm told)

SO unless you fail for a car running better than it was from the factory you should be right.
You funny Aussies with your funny words... like tyres and biscuit =P. Hehe, I'm just playin...

We always used to call them honeycombs (I used to work for Eastern Catalytic). They are actually called cores or substrates.
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Old 02-08-2008, 12:43 PM
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I actually like biscuit better.
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Old 02-08-2008, 01:10 PM
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I always knew it as honeycomb...
I had to kinda think about what he meant by "biscuits" lol.
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Old 02-08-2008, 01:25 PM
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yeup just go with the high flow cat.
no o2 prob unless you are obd2 in a 5th gen.
there is no o2 bung on the cat itself for 4th gens (correct me if there is on the newer obd2 4th gens).

a test pipe is just wat it sounds like...piping...plain old piping with no filter to prevent messing up the environment...thus the less restricting.
but its useless without everything else youre building up. and loud liek everyone mentioned...
a REALLY good high flow cat will be as unrestrictive as possible while still not hurting the env as much, thus allowing you to pass emissions etc.

id also recommend the carsound (magnaflow makes it) cause its cheap like 80 ish new and still awesome. the random tech one is goodddd too butt super exp compared..mabe around 200? like oem new from dealership is also 200+.

you want to get the right size for your application..
stock prelude is i believe 2". i kept in mind my furture build so i got the 2.5 to match my exhaust. actually i have an extra new in box carsound 2" (store sent me wrong size eh). pm me if you want it. but id suggest you pick up the size you want for later down the road..

o but the bad thing is liek all cats, the honeycomb/biscuit?? haha can ****ter inside if you say bottom out on it......itll start to go raspy and buzz..
BUT at that point hollow it out and boom youve got yourself a "test pipe" (not that i support the fumes emitted but its just a thought for you).
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Old 02-08-2008, 02:06 PM
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^she's right, however, you have just as much a chance of breaking a honeycomb in a regular cat as you do a high flow cat... their construction is identical except for the amount of cells (openings) there are in the honeycomb. So, don't bottom out =P.
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Old 02-08-2008, 02:39 PM
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Quote:
Originally Posted by rheakpl View Post
yeup just go with the high flow cat.
no o2 prob unless you are obd2 in a 5th gen.

Are you saying I'll throw a code or have problems with emissions since im obd2? I got the random tech cat. Dang.
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Old 02-08-2008, 03:34 PM
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yeups any cat can break if you hit it...funny it censores the word sh@tter?? erf.. but yea i like the flatter vs the oval cats so you get a tad mroe clearance....i mean if you can fit it on your car.

no mr poop, haha sorry, you shouldnt have a prob if you are obd2 and got a random tech cat thats specifically for obd2 5th gens (they should come with a bung/hole for the o2 sensor). just take a look at it, compare.

i just rem that the 5th gen has the o2 sensor on the cat itself thats all.
otherwise im sure you will throw an o2 sensor cel then, cause it will have no where to go...
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Old 02-08-2008, 03:53 PM
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Yeah... and even if your CAT doesn't have an O2 bung in it, you can go buy one, bring it to a muffler shop, and have them plasma cut and weld the bastard in there. Just remember that the O2 bung goes on the outlet portion of the cat, not the inlet portion (I'm not sure if ours go on the outlet pipe nipple or the outlet portion of the can... I think it's the outlet pipe nipple though)
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Old 02-08-2008, 07:16 PM
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well i know my header is 2.25 and im pretty sure my cat-back is the same. i plan to boost though. assuming 2.25 isnt gonna hurt me once/if i do go turbo then thats what size i think im gettin.

i was thinkin more the 40 dollar ebay ones. is there a difference?
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Old 02-08-2008, 11:36 PM
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nick if you can, get at LEAST a 2.5" cat, especially if your planning on boost. nothing worse than a small, restricting exhaust with boost (hangs head in shame)




this thread is getting dirty. bung, hole, nipple, openings... hahaha






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Old 02-09-2008, 04:37 AM
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i figured if got a wider pipe wouldnt that quarter inch difference where the pieces meet be like catching air and maybe makin funny noises?
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Old 02-09-2008, 09:44 PM
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^^^^correct?

as long as i know the width of the pipe does it matter what brand it is.
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Old 02-10-2008, 05:37 AM
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nah getting a 2.5 inch cat on a 2.25 inch exhaust isn't gonna make any "funny" noises I don't think... it might act as a slight resonator... but it's probably gonna change the tone of the exhaust either way (even if it was 2.25) because it's high flow to begin with.

If you plan on boost... you definitely want 2.5 or a little higher.
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