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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 02-17-2010, 12:52 PM   #1
fisher_330ci
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AFE CAT Back style exhaust?

I need some opinions/theory/experience with exhaust. I would like to change up my stock exhaust with something custom. I am looking for a sound similar to the AFE CAT Back system for the 135i. This system sounds amazing. I would love for my car to sound this good.



Has anyone tried an exhaust setup like this on an e46? Essentially it is just a muffler delete with a resonance tube. I don't completely understand exhaust and sound setup, but I do know that the more free flowing the better. The only part I can't duplicate is the turbo setup on the 135i. Canceling out certain sound waves would allow for a different tune. But ,with this more or less straight through design, will this "resonance tube" make any difference.

I really like the sound the 135i has. It is perfect for me. The only thing keeping me from doing this is just the fact that once I start cutting there is no going back in my mind. Being uncertain of the sound results I am hesitant to go ahead with the setup... but I am tired of the stock setup. SO, any ideas/suggestions?

As far as just doing a muffler delete, I would, but I don't want the backfire sound or the extreme rasp. A little rasp is good, but not a ton. I would be keeping both res' and CATs on my car.

What do you guys think?
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Old 02-17-2010, 12:58 PM   #2
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yes, if you do a search, there are plenty of guys who have deleted their rear muffler, but kept the middle resonator. Design-wise that's essentially the same thing. As you've mentioned, it's not a direct comparison, sound wise, when you factor in the sound of a turbo setup.
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Old 02-17-2010, 01:07 PM   #3
fisher_330ci
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Originally Posted by mtnbound View Post
yes, if you do a search, there are plenty of guys who have deleted their rear muffler, but kept the middle resonator. Design-wise that's essentially the same thing. As you've mentioned, it's not a direct comparison, sound wise, when you factor in the sound of a turbo setup.
Right, but the resonance tube is my main wonder. Depending on what kind of exhaust system you have depends on the sound... obviously... but what I mean is... Say you have a exhaust setup that allows a "free flow" design but there are reflective bends that cancel out certain sound waves... or rasp/rattle. Will this resonance tube act in a manner that will give the exhaust a deeper tone with less rasp/rattle?... will it cancel out the annoying (to some) sound waves?

Maybe I just think too much.... ha

*edit: Trust me... I have searched and searched.... thats why I posted. At a loss.... Thanks though.
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Old 02-17-2010, 01:21 PM   #4
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Originally Posted by fisher_330ci View Post
Right, but the resonance tube is my main wonder. Depending on what kind of exhaust system you have depends on the sound... obviously... but what I mean is... Say you have a exhaust setup that allows a "free flow" design but there are reflective bends that cancel out certain sound waves... or rasp/rattle. Will this resonance tube act in a manner that will give the exhaust a deeper tone with less rasp/rattle?... will it cancel out the annoying (to some) sound waves?

Maybe I just think too much.... ha
In short, yes, the resonator is more responsible to reduce rasp (resonance). Mufflers primarily lower the overall volume.

Since the muscle car guys are deep in knowledge about how to deal with loud exhausts, here's some insight that might help:

"A resonator uses a tuned cavity to actually actively cancel out sound. It creates a band-pass filter that eliminates problem frequencies - so they tune it for a specific loud spot in engine operation. It targets only a small range of frequencies.

A muffler is usually a series of expansions that take energy from the gas flow to decrease sound. Sometimes they have resonating chambers built in, but typically they operate on a purely expansive vane - expanding a gas so many times into such a volume muffles certain frequencies.

Basically, in the real world, with a resonator you'll be able to quiet specific exhaust notes - usually targeted to a cruise RPM to cancel that frequency, but you'll still have a lot of harshness from the high frequencies the resonator passes, which a muffler will cut out.

The good thing with resonators is that they usually have zero flow restriction, so adding them to quiet an existing setup will cost no power.
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Old 03-23-2010, 11:49 AM   #5
fisher_330ci
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Just got back from the exhaust shop and I have an appointment to get this exhaust setup done to my car next Wednesday.

My dual staggered angle cut tip finally came in and it should look really nice...

I will post up a video as soon as I get my TMS Sway bars on and the summer wheels and tires. Hopefully next weekend... ish.
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Old 05-27-2010, 12:21 PM   #6
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I've had this exhaust on the car since March. I love it. Sounds really, really good. Better in person than with a crappy still shot camera with a "video" function, but you'll get the idea. Been lazy and haven't posted video's. Finally got around to it today.

What do you think?

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Old 05-27-2010, 10:59 PM   #7
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nice. that'd be cool if you play with teh length of that tunning pipe to see if you could get different tones.
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