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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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      04-19-2012, 01:54 PM   #111
DJ Apex
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i almost didn't get the sarcasm above =P such a confusing conversation haha
LOL
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      08-10-2012, 01:15 AM   #112
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Yesterday, I deleted header cat,mechanic made it in 4.5 hours. Then I went to the electrician and he hooked me BMS DPfix. No errors, I hope will not appear.
The sound became a little louder. But here's how to write an additional 15-20 were added and I feel it. On the dyno I'm going later when i choose which tune to do.
Total cost 390$ (cat delete 260$, 120$ BMS and 10$ to install it)
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      08-10-2012, 01:35 AM   #113
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thanks for sharing. make sure to post dynos. What else do you have for performance mods?
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      08-10-2012, 06:08 AM   #114
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K&N drop-in, charcoal filter delete, and some suspension mods(bmw performance with eibach springs and antiroll kit eibach).
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      08-10-2012, 12:23 PM   #115
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Quote:
Originally Posted by Clayshooter View Post
Yesterday, I deleted header cat,mechanic made it in 4.5 hours. Then I went to the electrician and he hooked me BMS DPfix. No errors, I hope will not appear.
The sound became a little louder. But here's how to write an additional 15-20 were added and I feel it. On the dyno I'm going later when i choose which tune to do.
Total cost 390$ (cat delete 260$, 120$ BMS and 10$ to install it)
Sounds good! Are you running a N54 engine? Or N52?

I have N52 and read that the BMS DP fix will not work on N52

Let us know the Dyno results
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      08-10-2012, 07:25 PM   #116
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Originally Posted by RupertPupkin
Make some affordable ones! Give Gavin some competition. 1000 is way too much. OBX to fix theirs to fit and I would be all over them.
Lol! $1000 too much? Ahahahahaha even AVERAGE headers for a honda are close to $1k, and good ones (mugen or something) are 1.5-2k

Ahahhaha

Ed: and i also read 'factory headers optimum design' some crap? LOL the headers are designed purely around cats asap to reduce emissions. They have VERY sharp bends and merge FAR too soon (gases too hot and buffeting rather than merging quickly)

Yeah this is a mod that'll get you very noticable gains, but even comparing it to a real replacement headers... Totally another league.
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      08-10-2012, 08:12 PM   #117
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I still love this mod even if it took hell and a day to work out all the bugs but top end is a beast now. I still need a TRUE dyno tune cause im still running on AA's stage 2 tune. but i know there are more gains to be opened up with a true tune.
In time when afforable headers come out i will convert but for now this is the best my wallet has too offer
http://www.youtube.com/watch?v=-c6S5FFYySo
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      08-10-2012, 11:08 PM   #118
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Quote:
Originally Posted by flinchy View Post
Lol! $1000 too much? Ahahahahaha even AVERAGE headers for a honda are close to $1k, and good ones (mugen or something) are 1.5-2k

Ahahhaha

Ed: and i also read 'factory headers optimum design' some crap? LOL the headers are designed purely around cats asap to reduce emissions. They have VERY sharp bends and merge FAR too soon (gases too hot and buffeting rather than merging quickly)

Yeah this is a mod that'll get you very noticable gains, but even comparing it to a real replacement headers... Totally another league.
don't know about optimum design but there was a thread a while back in which a race team picked oem catless headers instead of supersprint. I don't believe anyone thinks they are optimum.
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      08-11-2012, 09:26 AM   #119
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Quote:
Originally Posted by mapleridge
Quote:
Originally Posted by flinchy View Post
Lol! $1000 too much? Ahahahahaha even AVERAGE headers for a honda are close to $1k, and good ones (mugen or something) are 1.5-2k

Ahahhaha

Ed: and i also read 'factory headers optimum design' some crap? LOL the headers are designed purely around cats asap to reduce emissions. They have VERY sharp bends and merge FAR too soon (gases too hot and buffeting rather than merging quickly)

Yeah this is a mod that'll get you very noticable gains, but even comparing it to a real replacement headers... Totally another league.
don't know about optimum design but there was a thread a while back in which a race team picked oem catless headers instead of supersprint. I don't believe anyone thinks they are optimum.
That would be due to cost, ss headers are an unbelievable ripoff, something like 2.5 or 3k
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      08-12-2012, 06:52 AM   #120
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That would be due to cost, ss headers are an unbelievable ripoff, something like 2.5 or 3k
I don't think a race team is concerned with costs like the average Joe. They run through tires and brakes that cost more. Super sprint is only around $1300 or so now. Also they mentioned design as a reason stating that considerable gains weren't worth it over cutting stock pipes. Plus I have seen 15 whp dynos too.
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      08-12-2012, 07:25 PM   #121
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Quote:
Originally Posted by mapleridge
Quote:
Originally Posted by flinchy View Post
That would be due to cost, ss headers are an unbelievable ripoff, something like 2.5 or 3k
I don't think a race team is concerned with costs like the average Joe. They run through tires and brakes that cost more. Super sprint is only around $1300 or so now. Also they mentioned design as a reason stating that considerable gains weren't worth it over cutting stock pipes. Plus I have seen 15 whp dynos too.
No its not i looked at the price last week. Still stupid.

The tires race teams run depending on what requirements are, are usually actually not too badly priced.. When the most exxy tires you can really get street are $400-$450 each
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      10-20-2012, 01:02 AM   #122
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You need to get your car on a dyno son !!

I've been contemplating deleting the headers and going back to my oem muffler. With a res delete.

I want to keep the secondaries in because I need to pass visual inspection.
do that and get a cut out so it can be loud when you want it thats what im thinking about doing
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      10-31-2012, 10:07 AM   #123
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old pennys lol just kidding they fit flush we just used that to mock up were we need to weld at we ended up expanding the factory pipe to 2.5 to fit even and welded it all up! i have 25miles on it and still no SES light im waiting for the ECU to readapt and then all hell time for tune
is that just the header cat delete or do you have a muffler delte aswell or secondary cat/res? what im asking is what else to you have cut out?
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      07-30-2013, 04:26 AM   #124
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DJ Apex. How is this mod working out for you a year later?
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