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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 > actual gains from secondary cat delete?



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      01-05-2012, 11:58 AM   #1
redlinedbimmer
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actual gains from secondary cat delete?

What are the actual gains to the wheel with a secondary cat delete, with a tune? Is their a point to purchasing a set of aftermarket mid pipes when you could probably just take your car to an exhaust shop and have them cut out the secondary cats?
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      01-05-2012, 12:09 PM   #2
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i was wondering the same recently and according to many dynos and some posts i found a 3 series catback exhaust is unrestricted to 400+whp (with catless downpipes) but the 1 series (135/1M) catback is and on a 1 series you would see gains ...
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      01-05-2012, 12:19 PM   #3
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no offense but I don't see any relevance to your post; this is the non turbo section
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      01-05-2012, 12:28 PM   #4
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Quote:
Originally Posted by redlinedbimmer View Post
What are the actual gains to the wheel with a secondary cat delete, with a tune? Is their a point to purchasing a set of aftermarket mid pipes when you could probably just take your car to an exhaust shop and have them cut out the secondary cats?
i know i cut my 2ndarys when i had my muffler delete i really didnt feel a diffrance but i did notice it to open up a bit of top end. And what tune would u be going? cause that in it shelf would make the delete more noticeable.
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      01-05-2012, 12:51 PM   #5
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Well I have a eurocharged tune now, but I would get it retuned by them after getting the cat delete. I don't want to delete my muffler, which from reading sounds like I might get more overall gains if I deleted the cat but left the muffler on because I wouldn't lose the back pressure right? I'm not trying to make it super loud, just want more power, but I wouldn't mind a little sound. I just don't want it to smell like an uncatted car, I didn't think it would considering we have the primary cats still in the headers. Also curious how just deleting the cats would change the overall sound, leaving the rest of the exhaust stock, everyone else seems to delete the cats and resonator or muffler.
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      01-05-2012, 09:51 PM   #6
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^I've never heard it in person, but I have heard from people that stock muffler with secondary cat and resonator delete doesn't sound any louder.
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      01-10-2012, 08:19 PM   #7
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Unless you have a muffler delete or aftermarket muffler theres gonna be no sound. Im currently running secondary cat delete and resonator delete and it sounds stock. Performance wise, no difference
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      01-10-2012, 08:25 PM   #8
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I think someone in the forum mentioned that main cat is 400-800cells and secondary are metallic 200 cells. so bottleneck still at the main cat.
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      01-10-2012, 09:24 PM   #9
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Why do we have secondaries? Damn US regulations....
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      01-10-2012, 10:36 PM   #10
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Only Dyno I can remember seeing is the one DetailAddict did on his custom exhaust that deletes the resonator and secondary cats. He added 5 hp and 5 lbs to the wheels with no tune and everything else stock. Muffler was aftermarket magnaflow. I bought the set up myself but I have yet to install it.
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      01-11-2012, 03:59 AM   #11
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Quote:
Originally Posted by ********* View Post
Why do we have secondaries? Damn US regulations....
Secondary cats are on European version too. I installed Supersprint cutback exhaust. Itís not any louder than the stock and if there is any power gain itís not much.

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      01-11-2012, 04:43 AM   #12
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      01-11-2012, 10:10 AM   #13
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maybe a tune is needed to take advantage of it?
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      01-11-2012, 10:50 AM   #14
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Anytime you improve exhaust flow you more than likely need to tune the Exhaust. On cars this isn't as noticeable but on motorcycles if you put even a slip-on with a stock engine you can actually put a wide band O2 on the exhaust and see that it is running a little leaner than normal and also the bike is no longer as smooth as it should be.

I would recommend a tune anytime you modify exhaust flow.
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      01-11-2012, 01:17 PM   #15
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There are no gains IMO. I don't feel a difference.
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      04-16-2013, 08:54 PM   #16
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Sorry for bumping this but kinda relates to exactly what I want to do lol.

Was thinking of doing secondary cat delete and resonator delete, followed by eurocharged tune.

Did you ever go through with it OP? Kinda ironic you're in chicago too.. this thread fits my question too well..
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      04-16-2013, 11:43 PM   #17
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Quote:
Originally Posted by DUI Elite View Post
Sorry for bumping this but kinda relates to exactly what I want to do lol.

Was thinking of doing secondary cat delete and resonator delete, followed by eurocharged tune.

Did you ever go through with it OP? Kinda ironic you're in chicago too.. this thread fits my question too well..
Wtf is up with you bumping all these threads that are over a year old???
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      04-17-2013, 08:32 AM   #18
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Quote:
Originally Posted by DUI Elite View Post
Sorry for bumping this but kinda relates to exactly what I want to do lol.

Was thinking of doing secondary cat delete and resonator delete, followed by eurocharged tune.

Did you ever go through with it OP? Kinda ironic you're in chicago too.. this thread fits my question too well..
Quote:
Originally Posted by rattmobbins View Post
Wtf is up with you bumping all these threads that are over a year old???
Read.

Wtf is up with you replying in a thread you don't contribute anything useful to?

Making a new thread about clarification is useless.

Last edited by DUI Elite; 04-17-2013 at 08:39 AM.
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      04-17-2013, 09:18 AM   #19
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there was that thread where the guy put down 212rwhp....all he had was PE and 2nd cat delete. he said the 2nd cat delete was worth 9rwhp and 3rwtq....


Il search for the thread
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      04-17-2013, 09:20 AM   #20
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Quote:
Originally Posted by Rival View Post
there was that thread where the guy put down 212rwhp....all he had was PE and 2nd cat delete. he said the 2nd cat delete was worth 9rwhp and 3rwtq....


Il search for the thread
Oh okay. Didn't find this one. Thanks boss. I'll look around more.
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      04-17-2013, 10:15 AM   #21
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      04-17-2013, 10:52 PM   #22
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