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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Removing cat and res???



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      01-29-2013, 02:23 PM   #1
SuckMy_Nick
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Removing cat and res???

So I went to a custom exhaust shop in MA, I asked for better sound and flow, he suggested to delete my second cat and my res... Is this the best options? I've seen alot of people do different combinations of deletes and have heard alot of opinions.. Any one with helpful opinions and not just bias
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      01-29-2013, 05:01 PM   #2
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if you do that, it will be LOUD, so make sure that's what you want.
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      01-29-2013, 05:33 PM   #3
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Quote:
Originally Posted by mike-y View Post
if you do that, it will be LOUD, so make sure that's what you want.
No, it won't be that loud, especially into a stock exhaust.
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      02-01-2013, 06:49 PM   #4
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Highly recommend performing a secondary-cat-ectomy. We cut those out at my local shop and tossed them in the dust bin. Worthless little pieces of crap!

Now whatever other exhaust mods you do will be a true enhancement.

Cheers mate
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      02-01-2013, 07:22 PM   #5
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I have the perfect recommendation for you. Check it out!

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      02-01-2013, 09:52 PM   #6
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Like !!
Whooo Whoooo !!!
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      02-01-2013, 10:43 PM   #7
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Quote:
Originally Posted by RaddN54
I have the perfect recommendation for you. Check it out!

Still got my whistle installed, I wanna make it louder
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      02-02-2013, 01:21 AM   #8
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Not that loud. I have PE which is res-less and cat delete and i would say its a good volume
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      02-02-2013, 03:20 AM   #9
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Originally Posted by SDemetris View Post
Not that loud. I have PE which is res-less and cat delete and i would say its a good volume
Secondary cat delete or primary? Don't the primary cats on the headers, if taken out, release more power than taking out the secondary cats?
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      02-02-2013, 03:07 PM   #10
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Quote:
Originally Posted by Amini77 View Post
Secondary cat delete or primary? Don't the primary cats on the headers, if taken out, release more power than taking out the secondary cats?
Secondaries.
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      02-02-2013, 03:21 PM   #11
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Quote:
Originally Posted by SDemetris View Post
Secondaries.
That only answered 1/3 of my questions lmao
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      02-02-2013, 05:20 PM   #12
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Quote:
Originally Posted by Amini77 View Post
That only answered 1/3 of my questions lmao
Sorry i was on my phone.. i only got my secondaries off because it was cheaper and i didnt have to buy any O2 sims.. but your understanding is correct
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      02-02-2013, 05:33 PM   #13
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still debating if this is worth it.

I've been tossing around the idea for months. I've noticed my exhaust is getting louder (as the exhaust ages). My parents even ask, when I rarely have them in the car, if I did something to it as they don't remember it being as loud when I had it new.

I kinda want to trust them in thinking its gotten louder because they've only been in it a few times over a pretty good amount of time since I've had it and they're picking up on a difference.
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