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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Ultimate Racing Exhaust being put on right now..



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      04-20-2007, 07:39 PM   #23
all8up
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Quote:
Originally Posted by S4to335 View Post
Mine sounds very very nice...thumbs up to Ultimate Racing. Not too loud..not too mellow...definitely sounds modified...in a good way. I am very happy with my purchase...

BTW, I am not close to the bumper like those other pictures show...I have more room between the exhaust..and the bumper bottom.

Oh yeah...and I think it must added at least 1,000 bhp to the car..I can definitely take Veyrons now...
Even though those pictures look otherwise, my exhaust doesnt touch the bottom of the bumper, rather it touches a lower corner and at that part I put the rubber tubing in place.
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      04-20-2007, 08:16 PM   #24
6SpeedMan
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Please give us a little insight on the sound of the exhaust, that would be damn greatly appreciated.
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      04-20-2007, 09:17 PM   #25
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all8up. what size tips are those?
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      04-20-2007, 09:52 PM   #26
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I know what Magna3 and all8up are talking about at the lower rpm ranges..and I am totally fine with that sound. It is just the loudest part of the exhaust. It sounds really nice folks....I am very impressed with the low weight of the unit ...and the sound. To me..it sounds like some modified porsches I have heard on track. I am very happy with my purchase..and will not change a thing.
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      04-20-2007, 10:15 PM   #27
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Any pics from underneath when it was up on the lift?
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      04-20-2007, 10:28 PM   #28
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Sigh...reading this just makes me upset that not many tuners have come out with a catback for the 328. Us lower folk just gotta wait a bit longer...

Anyways, nice to hear you guys are enjoying your new toy!!
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      04-20-2007, 10:39 PM   #29
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Itís a drone (vibration) that occurs right around 2000 rpm. Now this drone only occurs under load and inside the cabin only. I guess it's to be expected with nothing but long pipes between the cats and the mufflers. Outside the overall volume hasnít increased that much. Best way to describe it is a deep aggressive growl. No tin, no rasp.

As for the drone, the guy at the shop suggested putting in two 16Ē resonators along the straight portion of the test line. Any comments on whether this would help tone down the resonance?
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      04-20-2007, 11:14 PM   #30
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Quote:
Originally Posted by Magna3 View Post
Itís a drone (vibration) that occurs right around 2000 rpm. Now this drone only occurs under load and inside the cabin only. I guess it's to be expected with nothing but long pipes between the cats and the mufflers. Outside the overall volume hasnít increased that much. Best way to describe it is a deep aggressive growl. No tin, no rasp.

As for the drone, the guy at the shop suggested putting in two 16Ē resonators along the straight portion of the test line. Any comments on whether this would help tone down the resonance?
I also have the same resonance with my UR--I have driven All8up's car and his seems to have less vibration and noise than mine at that RPM range. I'm also hoping that the issue can be resolved with resonators of some sort. The noise doesn't bother me too badly most of the time, but it literally makes my wife ill on extended trips, so I definitely need to address it. I'm just hoping it doesn't cost an arm and a leg to have resonators installed. Please let me know your results if you try the resonator approach--it should work. Otherwise, this exhaust is outstanding--it's a 400rpm band away from being perfect!

Last edited by BHairsto; 04-21-2007 at 07:31 AM.
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      04-21-2007, 05:09 AM   #31
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pics?
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      04-21-2007, 06:07 AM   #32
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Quote:
Originally Posted by Magna3 View Post
Itís a drone (vibration) that occurs right around 2000 rpm. Now this drone only occurs under load and inside the cabin only. I guess it's to be expected with nothing but long pipes between the cats and the mufflers. Outside the overall volume hasnít increased that much. Best way to describe it is a deep aggressive growl. No tin, no rasp.

As for the drone, the guy at the shop suggested putting in two 16Ē resonators along the straight portion of the test line. Any comments on whether this would help tone down the resonance?

My other solution would be to hack your stock exhaust and reuse the secondary cats that mate up to the downpipe flange. Not sure if that would be equally as effective as the resonator approach.


Chris b
I'm pretty sure they are 4" rolled tips btw.
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      04-21-2007, 09:44 AM   #33
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all8up

So cats have an effect on dampening resonance? I spoke with the shop and they said they can open up the 2.25" inlets on the cats to match the 2.5" pipes. And it would be a cheap fix / 1 hour labor @$75.
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Last edited by uberschnell; 04-21-2007 at 03:44 PM.
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      04-22-2007, 11:43 PM   #34
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Quote:
Originally Posted by Walked U View Post
How much did they charge you ? And was it from the primary cats back?

Im looking for an exhaust for an e90.
Hey Waked You, you could put two cutuouts since you like the underground stuff. Have the stock sound, and the none stock to surprice.
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      04-23-2007, 06:52 AM   #35
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Quote:
Originally Posted by Magna3 View Post
all8up

So cats have an effect on dampening resonance? I spoke with the shop and they said they can open up the 2.25" inlets on the cats to match the 2.5" pipes. And it would be a cheap fix / 1 hour labor @$75.
That could work, but keep in mind you are sacraficing some performance for that since you are re-introducing a restriction.
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      04-23-2007, 12:11 PM   #36
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I would use resonators to remove drone, cats are too restrictive. I am using 2 Autospeed mufflers and two 16" resonators in my exhaust, and i am removing the secondary cats.
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      04-23-2007, 12:21 PM   #37
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Mine doesnt have any bad resonance..I am not changing anything in that respect.
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