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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 01-12-2013, 11:51 PM
loso81 loso81 is offline
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what is a down pipe?

what exactly is a downpipe, and does it give your factory exhaust a more aggressive sound? My recent car that i had prior to my 09 335xi was a infiniti g35 coupe, the factory exhaust on my g35 coupe sounded "sexy" and had a more aggressive sound than my 335xi. Help! lol
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  #2  
Old 01-13-2013, 12:05 AM
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lqaddict lqaddict is online now
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Quote:
Originally Posted by loso81 View Post
what exactly is a downpipe, and does it give your factory exhaust a more aggressive sound? My recent car that i had prior to my 09 335xi was a infiniti g35 coupe, the factory exhaust on my g35 coupe sounded "sexy" and had a more aggressive sound than my 335xi. Help! lol
Get the BMW performance exhaust for a finer acoustic quality.

downpipe
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Last edited by lqaddict; 01-13-2013 at 12:07 AM.
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Old 01-13-2013, 06:53 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by loso81 View Post
what exactly is a downpipe, and does it give your factory exhaust a more aggressive sound? My recent car that i had prior to my 09 335xi was a infiniti g35 coupe, the factory exhaust on my g35 coupe sounded "sexy" and had a more aggressive sound than my 335xi. Help! lol

The pipe that goes down from the cyl head to the exhaust pipe running aft.

Sound? Wikipedia "muffler"

Add'l info for 335i - click Post #2 links.

Beware. Changing back pressure on an engineered-to-the-edge ride like yer 335i is fraught with performance issues. You're safe with BMW performance exhaust, which comes with a factory software adj and $1100+ wallet lightener.

Much tech info at N54TECH and E90POST.


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Last edited by CALWATERBOY; 01-13-2013 at 06:56 AM.
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Old 01-14-2013, 06:08 AM
E90Dad E90Dad is offline
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Dare I post this? http://www.e90post.com/forums/showthread.php?t=80661

it's easily reversible if you have any negative side effects, though may store fault codes in the ECU.
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Old 01-14-2013, 02:51 PM
loso81 loso81 is offline
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are there any other exhausts out there that will give my car a more aggressive sound than than the bmw performance exhaust, they are rather pricey
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Old 01-14-2013, 03:01 PM
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LarkHouston LarkHouston is offline
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Originally Posted by loso81 View Post
are there any other exhausts out there that will give my car a more aggressive sound than than the bmw performance exhaust, they are rather pricey
Plenty. Just depends on how much drone you can stand.

I believe your exhaust has resonators which can be removed and increase the sound. May be the cheapest option for you if sound is all you are looking for.
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Last edited by LarkHouston; 01-14-2013 at 03:02 PM.
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Old 01-14-2013, 03:44 PM
loso81 loso81 is offline
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in your opinion which is a an exhaust thats good but not too costly that gives a nice "growl". also sometimes when i rev my car, i hear a "rattle" sound at times, could that be something with the exhaust?
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Old 01-14-2013, 06:58 PM
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CALWATERBOY CALWATERBOY is offline
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Originally Posted by E90Dad View Post
Dare I post this? http://www.e90post.com/forums/showthread.php?t=80661

it's easily reversible if you have any negative side effects, though may store fault codes in the ECU.

Back pressure reduction reduces torque below, what, 3k rpm. Increases sound, true. Easiest exhaust mod by far. Leaves flap that routes all exhaust to the right pipe open so it flows through both pipes.

Just crimp the line at the driver side actuator with wire tie. Easier, and much easier to reverse.

Naturally, you do this at your own risk. I didn't like the effect and sound was iffy enough that I went back to stock.
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Old 01-15-2013, 07:23 AM
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Quote:
Originally Posted by loso81 View Post
in your opinion which is a an exhaust thats good but not too costly that gives a nice "growl". also sometimes when i rev my car, i hear a "rattle" sound at times, could that be something with the exhaust?
No clue. I can't stand drone so if I went with another exhaust, I would get the BMW Performance Exhaust. You can buy them on ebay all day for $1099.

The rattle is a gate that is closed while the car is warming up and you are hearing it open/close. Very normal. As indicated above you can disable it in a couple of ways, if it bothers you.
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