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Catless (gutted cat)
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2001Ls
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PostPosted: Mon Apr 02, 2012 12:35 pm    Post subject:  Catless (gutted cat) Reply with quote

I just wanted to say something about my experience replacing my cat over the last week. Currently I have the magnaflow 2405 (or close to that number) that I installed this saturday. I reset my pcm to get the p0420 code off and I believe I have gone through a full driving cycle. I am unhappy with the results Sad . The reason is because I basically gutted my cat last week before I could get the new one on and the car had much more torque and hp than it does now with the new pipe. Now it is possible that the pcm is not fully reset but so far I have seen that as far as power goes a gutted cat or a straight pipe does have a pretty hefty gain on a L36 n/a. I keep reading people say that you will only get 1-2 hp with no cat but I am certain it was more like 20. I'm just saying that the magnaflow does bog you down compared to catless in my opinion. I might fully gut my old cat and throw it on for fun on some weekend in the future but not as an everyday thing... I know it is illegal, messes with backpressure, and is bad for the ozone.

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PostPosted: Mon Apr 02, 2012 1:57 pm    Post subject:   Reply with quote

Illegal smeagle... What does that word mean anyway? Lol Wink
I would say drive it some more, hit the freeway. I would think you would for sure see a difference between no restriction vs restriction, and I bet no car sounds a hell of a lot better! Is the new cat a high flow one?
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PostPosted: Mon Apr 02, 2012 2:11 pm    Post subject:   Reply with quote

I doubt you got 20 hp out of a gutted cat. It will more than likely set a code with a gutted cat as well unless of course you get that tuned out on the PCM.

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PostPosted: Mon Apr 02, 2012 5:20 pm    Post subject:   Reply with quote

I really doubt you're pulling anywhere near 20 horsepower from gutting the cat.

Only way to find out is to put it on the dyno.

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2001Ls
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PostPosted: Mon Apr 02, 2012 10:23 pm    Post subject:   Reply with quote

Today the air was cooler and the car responded better than yesterday.. but i'm still thinking catless does give more than 2hp.

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PostPosted: Mon Apr 02, 2012 10:30 pm    Post subject:   Reply with quote

2001Ls wrote:
Today the air was cooler and the car responded better than yesterday.. but i'm still thinking catless does give more than 2hp.

maybe, but its def not 20 lol

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PostPosted: Mon Apr 02, 2012 11:14 pm    Post subject:   Reply with quote

Confused Meh........

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PostPosted: Tue Apr 03, 2012 10:18 am    Post subject:  Re: Catless (gutted cat) Reply with quote

2001Ls wrote:
I just wanted to say something about my experience replacing my cat over the last week. Currently I have the magnaflow 2405 (or close to that number) that I installed this saturday. I reset my pcm to get the p0420 code off and I believe I have gone through a full driving cycle. I am unhappy with the results Sad . The reason is because I basically gutted my cat last week before I could get the new one on and the car had much more torque and hp than it does now with the new pipe. Now it is possible that the pcm is not fully reset but so far I have seen that as far as power goes a gutted cat or a straight pipe does have a pretty hefty gain on a L36 n/a. I keep reading people say that you will only get 1-2 hp with no cat but I am certain it was more like 20. I'm just saying that the magnaflow does bog you down compared to catless in my opinion. I might fully gut my old cat and throw it on for fun on some weekend in the future but not as an everyday thing... I know it is illegal, messes with backpressure, and is bad for the ozone.

stock cat can be used up to 300whp without hurting performance, sorry its all in your head if you think you got 20hp.
did you reset the pcm during cat change? probably why it feels sluggish, i was disappointed in my hv3 when i first installed but decided to wait for the pcm to relearn, glad i did cause after few days hv3 helped much more!

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PostPosted: Tue Apr 03, 2012 10:46 pm    Post subject:   Reply with quote

Yeah I am hoping thats the deal

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PostPosted: Sun Jul 08, 2012 11:17 am    Post subject: Question  Reply with quote

Just wondering how difficult it is to remove the cat on a 3.4 2001 Impala? Can you get to the bolts behind the engine from below or do you have to go over the top?

If the old cat was badly clogged it might give a 20 hp boost with it gutted.
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PostPosted: Sun Jul 08, 2012 11:40 am    Post subject: Question  Reply with quote

RJD357 wrote:

If the old cat was badly clogged it might give a 20 hp boost with it gutted.


True. As with many 3.8 Imps now turning 10+ yrs in age, the crystalization effect inside out cats have nearly if not completely clogged them. So gutting it would definitely yield quite a boost in HP. I went with a 2.5" Magnaflow cat, along with the U-bend and Res. delete, followed by a Flowmaster exhaust, and I know I released quite a bit of HP by freeing up the exhaust.

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PostPosted: Sun Jul 08, 2012 1:06 pm    Post subject:   Reply with quote

Or...take the cat into the scrap yard and get 50 bucks for it.
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PostPosted: Thu Jul 12, 2012 10:28 am    Post subject: Question  Reply with quote

RJD357 wrote:
Just wondering how difficult it is to remove the cat on a 3.4 2001 Impala? Can you get to the bolts behind the engine from below or do you have to go over the top?


I never did get an answer. Anybody?
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PostPosted: Thu Jul 12, 2012 11:49 am    Post subject:   Reply with quote

I don't have the car handy nearby today, but I beleive it's a welded component of the downpipe, then flange bolted to the u-bend. So you'd have to cut it out and weld in a section of pipe. And hope you live somewhere completely emissions-ignorant, otherwise you'll get nailed for it next time you go for emissions test.

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PostPosted: Thu Jul 12, 2012 12:06 pm    Post subject:   Reply with quote

Lingenfelter wrote:
I don't have the car handy nearby today, but I beleive it's a welded component of the downpipe, then flange bolted to the u-bend. So you'd have to cut it out and weld in a section of pipe. And hope you live somewhere completely emissions-ignorant, otherwise you'll get nailed for it next time you go for emissions test.


My plan was to replace my cat with a drop in magnaflow replacement, u-bend, flanges and all. I just wanted to know how difficult it is to get to the flange behind the engine to unbolt it there, and how hard it will be to get the rusted bolts off.
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