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General E46 Forum
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Old 03-08-2013, 07:20 PM   #1
TheModdedXI
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Exhaust Set UP

Which is better large tubing single exhaust or original BMW dual exhaust pipeing.

I plan on geting a custom exhaust with headers, universal cats, resonator and Borla muffler. Large diameter pipe single exhaust will be cheaper because it eliminates the need for 2 cats, 2 resonators, X-pipe, but it will need a Y-pipe. The dual how ever will cut cost by not needing to buy the larger pipe. Plus the dual in dual out muffler is more expensive and will not take my desired tips, But tips are no biggie.

Any Better Performance, Sound Difference.
Whats everyones thought?
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Old 03-08-2013, 08:49 PM   #2
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The deciding factor will be in the y-pipe if you convert to single...get a decent one that doesn't kill flow. Magnaflow is ok, Burns are the good ones. Also don't go too large on the pipes, and cram as much muffler and resonator (length-wise) that you can, or it will sound like sh!t.

Little to no "performance" difference. Honestly, your best bet is to keep the stock stuff and get good headers.
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Old 03-08-2013, 09:01 PM   #3
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I have ebay headers that fit, I was going to get a vibrant performance ultra quite resonator that is 14" long, with a borla that has a case length of 19". and a magna flow y pipe
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Old 03-08-2013, 09:05 PM   #4
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That's actually exactlythe setup I have on the e30. Sounds good, quite loud. Little bit of drone. Not sure how the M54 will respond. My M20 is a 12V Fe lump, but they do sound great.

Most people would probably consider it too loud/thricey/racecar for a DD. I am a masochist.
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Old 03-08-2013, 09:20 PM   #5
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My dual set up would be an obx dual resonator basically a muffler that has a case length of 16" with the same borla pro xs muffler but dual in dual out. Plus I have to pass emissions so im using high flow spun cats. Should I do an X-pipe. Total would be around 1,000 including installation and software to take away the engine light due to the headers
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Old 03-08-2013, 09:46 PM   #6
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I can't see any of that being worth $1K. Install the headers yourself, and have them do the flash?
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Old 03-08-2013, 10:10 PM   #7
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500 for the software, 60 for the resonator, cats for 100, muffler 140 and whatever tips the have in shop and I guessed around 150 for installation.
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Old 03-08-2013, 10:21 PM   #8
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Get performance headers, and dont run cats. and even a OBX exhaust is fine, or even the muffler delete is sexy
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Old 03-08-2013, 10:31 PM   #9
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I have to pass emissions and I have Headers. Just not installed yet. Did you even read the previous posts?
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Old 03-08-2013, 11:31 PM   #10
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$500 for the Euro tune is price gouging...do it yourself if there's no cheaper option. Or find a local-ish fanatic.

Universal cats suck, keep in mind that you'll be replacing them every few years (if not every time you want to pass the sniffer test).

Once again, worth nowhere 1K for a "sweet custom exhaust." You will feel minimal seat-of-the-pants improvement, and the sound will be good...but the sound would also be good with a $200 kpeng exhaust.
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Old 03-09-2013, 12:03 AM   #11
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never heard of kpeng. Its also daily driver therefore I don't want it to scream. I prefer deep sound. How do I do it myself (the euro tune) I don't know of any other way of getting one.

For the cats What else is there to put on to pass emissions with the ebay headers. Thanks I appreciate your responses, very helpful!
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Old 03-09-2013, 12:08 AM   #12
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never heard of kpeng. Its also daily driver therefore I don't want it to scream. I prefer deep sound. How do I do it myself (the euro tune) I don't know of any other way of getting one.

For the cats What else is there to put on to pass emissions with the ebay headers. Thanks I appreciate your responses, very helpful!
I was looking myself earlier and somehow got the impression one could just cut a stock header to improve.

Found this thread but again I can't use as my car uses Right Hand Drive

http://forum.e46fanatics.com/showthr...exhaust+header
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Old 03-09-2013, 12:09 AM   #13
TheModdedXI
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Also I'm a muscle car guy and Drive old trucks and restore them so I know Quite a bit. however with the BMW stuff Ive done research but this is what i needed. How loud will the glass pack exhaust be with headers?
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Old 03-09-2013, 12:16 AM   #14
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Either way the kpeng is around the same as mine. I mean I HAVE to have Cats so Im willing to pay 385 for parts including resonator borla cats and tips because mine need to be replaced. Thats not including installation and the ecu flash. If I'm going to have the fix the Check engine light i might as well get a tune that improves power over all.
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Old 03-09-2013, 01:16 AM   #15
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If you're good with cars trucks (unlike me!) then perhaps swap the Stock system back in for Emissions testing?
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Old 03-09-2013, 01:18 AM   #16
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look up aggie46. he has a thread on making power which is good.

If you want an exhaust that makes power, get good headers, get a Burns collector and put it RIGHT after the headers and go into a 3-3.5" exhaust. Run that single exhaust STRAIGHT out the back of the car as possible. You could get a bunch of glass packs or rasp eliminators or something to try to get it quieter, but if your serious about making power than what I've described is the only way to go.

The Shark Injector tune has proven to be the best for the 330's.

You can make the CEL go away by installing a O2simulator from o2simulator.com or something like that.

If your state requires a sniffer test then your car wont pass it. Just get it inspected now and the put the exhaust on after the inspection.
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Old 03-09-2013, 07:14 AM   #17
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If you have to have cats, keep the factory ones. You can get plenty of sound with them in place, and deleting the quality OE cats to replace them with crappy aftermarket ones in crappy aftermarket headers is a poor decision.

glasspacks, delete second res, leaves the headers alone. You'll get the sound you want.
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Old 03-09-2013, 07:45 AM   #18
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My dual set up would be an obx dual resonator basically a muffler that has a case length of 16" with the same borla pro xs muffler but dual in dual out. Plus I have to pass emissions so im using high flow spun cats. Should I do an X-pipe. Total would be around 1,000 including installation and software to take away the engine light due to the headers

I just installed Bimmernrakes GenII headers last weekend.I am running everything stock except a huge flowmaster pro 20 series muffler.. I also plan on getting a tune/flash to get rid of CEL ( for O2 code ) but what about the Secondary air pump code??? If I hook it back up,but it is not actually doing anything,will it still throw code?
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Old 03-09-2013, 08:53 AM   #19
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so much fail here, it isn't a v8


ex pipe sizes and flow, dual 2.25" compared to one 3", dual 2.25" flows more

PI*r^2=area of a circle

2" pipe = 3.14x1"x1"=3.14"x2=6.28"
2.25" pipe = 3.14x1.125"x1.125"=3.97"x2=7.94"
2.5" pipe = 3.14x1.25"x1.25"=4.91"x2=9.82"

3" pipe = 3.14x1.5"x1.5"=7.07"






you want dual 2.50" max, even sc this is more than enough, and a crossover

just get the magnaflow 16533
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Old 03-09-2013, 01:13 PM   #20
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so much fail here, it isn't a v8


ex pipe sizes and flow, dual 2.25" compared to one 3", dual 2.25" flows more

PI*r^2=area of a circle

2" pipe = 3.14x1"x1"=3.14"x2=6.28"
2.25" pipe = 3.14x1.125"x1.125"=3.97"x2=7.94"
2.5" pipe = 3.14x1.25"x1.25"=4.91"x2=9.82"

3" pipe = 3.14x1.5"x1.5"=7.07"






you want dual 2.50" max, even sc this is more than enough, and a crossover

just get the magnaflow 16533
Its not that simple. Trust me, a collector right after the headers into a 3" or 3.5" single is what makes the most power. Search for PEI330Ci or just look at the Bimmerworld race exhaust for the S54.
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