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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 > Factory Header Cat Delete!!!!! ( PICS INSIDE )



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      12-30-2011, 10:33 PM   #23
DJ Apex
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video uploaded! im editing one right now
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      12-30-2011, 10:50 PM   #24
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what other mods do you have besides the us/euro air box conversion and the headers? did you delete the 2ndary cats? the resonator? stock exhaust or something else?
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      12-30-2011, 10:53 PM   #25
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Originally Posted by ntpcrew13 View Post
what other mods do you have besides the us/euro air box conversion and the headers? did you delete the 2ndary cats? the resonator? stock exhaust or something else?
2ndary cats still in place with a shelf made magnaflow system. I made a thread about it look
http://www.e90post.com/forums/showthread.php?t=626393
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      12-30-2011, 11:03 PM   #26
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      12-30-2011, 11:04 PM   #27
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omg that sounds good man!
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      12-31-2011, 12:03 PM   #28
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**fkin christmas lights everywhere... (bahumbug) ... anyway... the head cat delete sounds pretty good. if my girl was riding in the passenger's set, she'd get annoyed by all the noise but that's not her concern. Anyway... i'm looking forward to these ceramic headers... if there's that much of a difference between wrapping the headers in cloth vs ceramic coating, i may just make a [+1} difference in wrapping them cloth too once they're installed.

Thanks for the vid! i know you took time out of your day to do it and i appreciate that.
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      12-31-2011, 01:05 PM   #29
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Originally Posted by lync9763 View Post
**fkin christmas lights everywhere... (bahumbug) ... anyway... the head cat delete sounds pretty good. if my girl was riding in the passenger's set, she'd get annoyed by all the noise but that's not her concern. Anyway... i'm looking forward to these ceramic headers... if there's that much of a difference between wrapping the headers in cloth vs ceramic coating, i may just make a [+1} difference in wrapping them cloth too once they're installed.

Thanks for the vid! i know you took time out of your day to do it and i appreciate that.
ya i can tell u this the wrap is like the best investment ive done after a good 45 min of hard driving. You can pop the hood and feel the diff! u can put your hand on the header wrap and its warm! Im gonna get temp read outs from mine and my buddys stock 325 to see how much of a change they did. And you guys are welcome for vids and all im just trying to do stuff on my own befor ditching out $$$$ for the real shit if i can make it on my own!
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      12-31-2011, 01:33 PM   #30
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well... i'm sure any part of your engine thats directly attached to your block is going to be warm... what methods are you planning on going about measuring the heat transferred from the headers back to the engine block?
cuz as i see it, convectional heat is going to be the same no matter what unless the material the headers is [made of] different... wrapping it in cloth is only affecting conventional heat; which isn't affecting the engine bay that much anyway...
The biggest and most purposeful modification is the primary catalytic converter deletion... heat transfer i'm sure is probably only a small portion of horsepower increase

looking foward to the dynos!
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      12-31-2011, 04:00 PM   #31
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Your car sounds good bro.
I applaud you for having the balls to come up with your own exhaust system, removing your primary cats and designing your own intake.
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      12-31-2011, 04:42 PM   #32
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Your car sounds good bro.
I applaud you for having the balls to come up with your own exhaust system, removing your primary cats and designing your own intake.
Thank u . I'm just trying to do it on my own as in to spending $1k on exhaust work and other crap i think so far ive put $380 in my whole exhaust and gettign a tune monday to bring back my mpg cause im getting 13.6 mpg and thats driving like a granny!
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      01-02-2012, 10:25 PM   #33
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on a old road out in the country! so its kinda safe lol
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      01-03-2012, 02:56 AM   #34
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your crazy. lol. Those tunes are an easy 10hp gain at the wheels too. Sounded amazing though. Did you finally get the engine light from the headers?
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      01-03-2012, 08:30 PM   #35
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nice 160mph! ^__^ is this after a tune?

and did you get your gas mileage back ?
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      01-03-2012, 08:48 PM   #36
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nice 160mph! ^__^ is this after a tune?

and did you get your gas mileage back ?
nope befor tune and i used like 2 gallons of gas doing that lol . im going in to mpower tomarrow local shop so they pull bmw codes and send them to AA so they can figure out best way to turn off my rear o2's and figure out why im getting such shitty mpg

i installed spark plug foulers and it worked for 90 miles then bam SES light! so idk even Avtive said that kinda gas millage with header is kinda odd
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      01-03-2012, 10:40 PM   #37
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I got a few questions. Is this mod proven to gain hp/tq?
Do resonator, cat, or muffler deletes guarantee gains?

If so how much? And can someone chime in as to why and provide the proof?

I understand the exhaust is more free flowing etc, but I'd like to see if there is solid proof.

Thanks in advance guys
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      01-04-2012, 12:49 AM   #38
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Quote:
Originally Posted by gtabfknkdnme View Post
I got a few questions. Is this mod proven to gain hp/tq?
Do resonator, cat, or muffler deletes guarantee gains?

If so how much? And can someone chime in as to why and provide the proof?

I understand the exhaust is more free flowing etc, but I'd like to see if there is solid proof.

Thanks in advance guys
from were i got the idea! http://www.e90
post.com/forums/showthread.php?t=382656



plus im going to dyno on the 28th to get numbers to compare to
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      01-04-2012, 11:01 PM   #39
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Yeahhhhhhhhhhhhhhhhhhhhhhh AA Off Road Tune Is A Must For This Mod Just A Lil Fyi For Anyone Who Wants To Do This
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      01-04-2012, 11:20 PM   #40
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What's the total gain AA is saying for deleting primary cats with the off road tune?
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      01-04-2012, 11:55 PM   #41
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What's the total gain AA is saying for deleting primary cats with the off road tune?
they dont know they have never done it with factory headers lol
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      01-05-2012, 11:52 AM   #42
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It's probably pretty close to aftermarket headers w/tune I would think.
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      01-05-2012, 10:10 PM   #43
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There was a thread where a race team chose factory delete over aftermarket. They might actually do better. On a side note has it started to smell?
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      01-05-2012, 11:37 PM   #44
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There was a thread where a race team chose factory delete over aftermarket. They might actually do better. On a side note has it started to smell?
nope the only thing that stinks is the exhaust wrap lol
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