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Old 07-18-2008, 12:41 PM   #1
Frogsthatmoo
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Default Should I do it?

I talked to my local muffler shop guy about having my resonator and catalytic converter removed, he said he'd do both and he would even install the bong that gaps the O2 sensor.

My question: Should I do it? The O2 sensor is bad, it keeps throwing a CEL.

Once I remove the resonator and Cat, will there be a drone? Will I notice the difference audibly? Any performance gains from removing the Cat?
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Old 07-18-2008, 12:47 PM   #2
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I wouldn't remove the resonator. But the cats can go and I would replace the O2 sensor and install a rear O2 spacer.

There will be an increase in noise volume, but you will gain a bit of power and reduce your overall weight.
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Old 07-18-2008, 01:36 PM   #3
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I would keep the resonator, or install an aftermarket one. Otherwise it'll sound like crap and drone a lot. It will also sound very raspy.

My take on mods is to do it 'right' or don't do it at all, but that is just me. Keeping that in mind, I think that the cats are the to help reduce emissions. If it's a track car, then straight pipe all the way. But if it's a dd, then you should use a cat of some sort (high-flow) to get the gains while still being "socially conscious". Basically, I don't think dumping a bunch of unburned hydrocarbons is worth a couple of HP, especially if you're driving a lot and haven't opened up the rest of your exhaust.

That being said, I have a full exhaust with a high-flow cat. I have heard, although I have not researched it enough to have my own hard data, that high-flow cats are more efficient at eliminating CO and unburned fuel than are the stock cats. That's why they cost more. They weigh a lot less.

Just my 2 cents!
Aaron
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Old 07-19-2008, 03:26 AM   #4
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Too late, I had both cats cut. Left the resonator on there though. I do appreciate your 2 cents though.

The only thing I've really noticed so far is that at about 5k and up a little it gets a bit raspy. I've also noticed that it pops/spits once in a while if revved up. Overall I'm happy with it though.
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Old 07-19-2008, 06:15 AM   #5
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careful with the popping, its burning up your valves.
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Old 07-19-2008, 01:03 PM   #6
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Quote:
Originally Posted by Frogsthatmoo View Post
Too late, I had both cats cut. Left the resonator on there though. I do appreciate your 2 cents though.

The only thing I've really noticed so far is that at about 5k and up a little it gets a bit raspy. I've also noticed that it pops/spits once in a while if revved up. Overall I'm happy with it though.
You forgot to mention that your car now stinks like poo and you are polluting for no other reason than saving a few bucks. HF cats are just as good performance wise.

Buy a HF cat at least, please. I'm not a tree huggin hippee, but show a little respect for future generations, or at least the people behind you at a stop light.

JS
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Old 07-19-2008, 05:59 PM   #7
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careful with the popping, its burning up your valves.
You're kidding me, right?
The popping is just run-over from a less restrictive exhaust.
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Old 07-20-2008, 02:10 AM   #8
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You're kidding me, right?
The popping is just run-over from a less restrictive exhaust.
Yeah, I kind of doubt that it's "burning up my valves". I figured it was at least some unburned gas igniting in the exhaust now.


And really, my car smells wonderful. I hope the people behind me at traffic lights enjoy it. I know, it's a douche bag thing of me to say. But I drive my car so little, that the cost of putting a HF Cat in would be stupid. Unless you want to pay for it
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Old 07-20-2008, 02:20 PM   #9
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Originally Posted by Frogsthatmoo View Post
Yeah, I kind of doubt that it's "burning up my valves". I figured it was at least some unburned gas igniting in the exhaust now.


And really, my car smells wonderful. I hope the people behind me at traffic lights enjoy it. I know, it's a douche bag thing of me to say. But I drive my car so little, that the cost of putting a HF Cat in would be stupid. Unless you want to pay for it
I'm sure (your) kids will enjoy paying for it when pollution in the US=Beijing on a good day...

seriously though, there are cheap solutions available, but to each his own.

JS
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Old 07-20-2008, 02:23 PM   #10
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I'm sure (your) kids will enjoy paying for it when pollution in the US=Beijing on a good day...

seriously though, there are cheap solutions available, but to each his own.

JS
Ok, I can see where this thread is turning already so please just give up on trying to guilt trip me. It's not going to work. I made up my mind, I don't give a crap about what you think.

My only remaining question now is how to fool the car into thinking the O2 sensors are working properly. The muffler shop guy suggested O2 simulators but they are pricey, and do they actually work? What about using the spark plug anti-fowler trick? How hard is that?
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Old 07-20-2008, 04:41 PM   #11
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Originally Posted by Frogsthatmoo View Post
My only remaining question now is how to fool the car into thinking the O2 sensors are working properly. The muffler shop guy suggested O2 simulators but they are pricey, and do they actually work? What about using the spark plug anti-fowler trick? How hard is that?
Drop an O2 spacer on the rear O2 sensor. The anti-fouler trick will work just fine.

You should get a new sensor though, at least for the front as it'll help your car run correctly.
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Old 07-20-2008, 05:45 PM   #12
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Just go to a junk yard and pull the 02 sensors from there, 5-10$ for all the ones you'd need. :\. 02 Sensors isn't something I'd play with as they can hurt your pocket by making your car run rich.
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Old 07-21-2008, 12:14 AM   #13
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Drop an O2 spacer on the rear O2 sensor. The anti-fouler trick will work just fine.

You should get a new sensor though, at least for the front as it'll help your car run correctly.

So spacer for the rear and the anti fouler for the front? Yeah, I do have to get a new sensor regardless though. I just have to work up to paying for it.
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Old 07-21-2008, 10:34 AM   #14
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^^^ no... anti-fouler = spacer. Only put the spacer on the rear O2.
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Old 07-21-2008, 10:35 AM   #15
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Just go to a junk yard and pull the 02 sensors from there, 5-10$ for all the ones you'd need. :\. 02 Sensors isn't something I'd play with as they can hurt your pocket by making your car run rich.
Subaru's run rich to begin with.
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Old 07-21-2008, 12:00 PM   #16
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^^^ no... anti-fouler = spacer. Only put the spacer on the rear O2.

So, just leave the front O2 sensor where it is (albeit replace it) and then a spacer for the rear O2 sensor.



I hope I got it right now.
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Old 07-21-2008, 12:04 PM   #17
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you got it!
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Old 07-21-2008, 12:26 PM   #18
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you got it!
Sweet
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Old 07-21-2008, 03:09 PM   #19
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Ok, I can see where this thread is turning already so please just give up on trying to guilt trip me. It's not going to work. I made up my mind, I don't give a crap about what you think.

My only remaining question now is how to fool the car into thinking the O2 sensors are working properly. The muffler shop guy suggested O2 simulators but they are pricey, and do they actually work? What about using the spark plug anti-fowler trick? How hard is that?
given your choice of "mods" and reasoning behind it i give you:




2 sad bannanas.
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Old 07-21-2008, 03:23 PM   #20
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You can get popping even with an HF cat.

Speaking from personal experience.
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Old 07-21-2008, 05:40 PM   #21
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I'm with Ben, I get plenty of popping with my Random setup if I try.
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Old 07-22-2008, 10:56 AM   #22
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given your choice of "mods" and reasoning behind it i give you:




2 sad bannanas.

Thank you for the sad bananas. I give myself three to counter your two.


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Old 07-22-2008, 11:11 AM   #23
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I'm with Ben, I get plenty of popping with my Random setup if I try.
Yeah, my Stromung HF pops if I'm engine braking sometimes, then step on the throttle lightly.

I kinda like it =]
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Old 07-22-2008, 01:42 PM   #24
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Yeah, my Stromung HF pops if I'm engine braking sometimes, then step on the throttle lightly.

I kinda like it =]
Not when you're slowing down into a turning lane and cops are on the opposite lane, waiting for the light
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