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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 > Just did a 2nd Cat delete



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      02-03-2011, 06:27 PM   #1
Wlew
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Just did a 2nd Cat delete

I must say, I love the sound. its not very different, but just a bit louder and deeper. its a good sound. I would recommend this to anyone. I will try and take a video soon, but no guarantees.

this is with the MMW CS muffler and a res delete.
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      02-04-2011, 12:32 AM   #2
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secondary cat delete ftw. our cars shouldve just came without them in the first place
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      02-04-2011, 02:57 AM   #3
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Nice! I'm next in line for this with my BMW PE
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      02-04-2011, 03:01 AM   #4
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would there be a difference with a stock muffler?
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      02-04-2011, 06:56 AM   #5
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I been debating if I should do this or not. My car already sounds great with the res delete and ikon muffler. If you do make a video, any chance you got any before vidoes to compare?
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      02-04-2011, 02:04 PM   #6
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theres a before video that jfisher did. I am sure he could do another one from outside the car. I will find a camera from a neighbor and make a video.

you should absolutely do this. its not a big increase but a nice addition. also a cold start sounds mean.

with a stock muffler, I highly doubt it. that thing is so quiet. deleting the res does nothing on stock, and this would only increase it a little bit.
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      02-04-2011, 02:20 PM   #7
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any errors ? will it pass emissions ?
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      02-04-2011, 02:37 PM   #8
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no errors since its not the primary cats. emissions is iffy though but i mean i think technically u can pass the computer test not sure about the visual though
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      02-04-2011, 03:20 PM   #9
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no errors. we will see about emissions when I go in next time... dunno if they do a visual or not. I heard in NC they dont do visuals. but I dont know where you are... so they might?
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      02-04-2011, 03:28 PM   #10
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also, if you do fail inspection due to this...go get em welded back on and then go back...
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      02-04-2011, 03:32 PM   #11
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Quote:
Originally Posted by slEEpy_aL View Post
would there be a difference with a stock muffler?
+1
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      02-04-2011, 03:36 PM   #12
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Quote:
Originally Posted by benzo23 View Post
+1
check my post above
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      02-04-2011, 03:56 PM   #13
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Quote:
Originally Posted by Wlew View Post
check my post above
Shit man im sorry must of missed that. Thanks tho.
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      02-04-2011, 04:02 PM   #14
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I was thinking of doing cats, but I'll just stick to resonators... should be pretty close.
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      02-04-2011, 04:46 PM   #15
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Anything register on the butt dyno when you had them cut out?
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      02-04-2011, 10:30 PM   #16
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Quote:
Originally Posted by slEEpy_aL View Post
would there be a difference with a stock muffler?
just cut the 2nd cat and resonator and leave stock muffler on......
i could only say the difference is noticable, but no big difference......
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      01-02-2013, 09:07 AM   #17
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When I did my res and 2nd cat delete on my325xi I did feel something on the butt dyno. Car is lighter ( Obv ), quicker IMO. I feel like challenging more cars, and spirited driving is awesome. I combination with my other mods I do feel quicker. But all is butt dyno.
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      09-18-2013, 09:11 PM   #18
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soo...how about that sound clip? hahaha
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