Why is my car so loud?

Slim415 · 12-17-2019, 07:40 PM

2011 335is
VRSF catless downpipes
AFE intake

I get that catless DP's are loud but at around 4.5K RPM, it sounds like an F1 car. It has this deafening high pitched note to the exhaust. It's awesome but I never would have expected it to be so effing loud. I wouldn't want to be next to me in a tunnel.

nicky dj · 12-17-2019, 07:46 PM

Quote:

Originally Posted by Slim415

2011 335is
VRSF catless downpipes
AFE intake

I get that catless DP's are loud but at around 4.5K RPM, it sounds like an F1 car. It has this deafening high pitched note to the exhaust. It's awesome but I never would have expected it to be so effing loud. I wouldn't want to be next to me in a tunnel.

Nah you get used to it. Straight piping it is loud

iqraceworks · 12-17-2019, 08:11 PM

Quote:

Originally Posted by Slim415

2011 335is
VRSF catless downpipes
AFE intake

I get that catless DP's are loud but at around 4.5K RPM, it sounds like an F1 car. It has this deafening high pitched note to the exhaust. It's awesome but I never would have expected it to be so effing loud. I wouldn't want to be next to me in a tunnel.

What kind of exhaust do you have on the car? I have the ARM catless downpipes on my car....and I barely noticed any difference between them and the stock downpipes.

Did someone delete the mufflers on your car?? Or the secondary cats?

Zach1328 · 12-18-2019, 01:49 AM

I am also running VRSF catless downpipes on an otherwise stock exhaust. It's definitely a bit louder in the mid-range under WOT and is fairly loud on a cold start.

However, if your N54 is THAT loud you may want to confirm the exhaust is bolted up properly and does not have any leaks. A few years ago I somehow lost a bolt off one of the downpipes. It was definitely very very loud when that one DP wasn't bolted securely.

type-dRew · 12-18-2019, 07:04 AM

An iS has more straight through muffler design, similar to PE mod or M Performance exhaust and being an E92, has no center resonator.

So stock, its only source of muffling really comes from the 4 catalytic converters. You deleted the 2 big ones, so you have nearly a straight piped system with 2 cats. Its going to make noise.

mweisdorfer · 12-18-2019, 09:51 AM

Quote:

Originally Posted by Slim415

2011 335is
VRSF catless downpipes
AFE intake

I get that catless DP's are loud but at around 4.5K RPM, it sounds like an F1 car. It has this deafening high pitched note to the exhaust. It's awesome but I never would have expected it to be so effing loud. I wouldn't want to be next to me in a tunnel.

That is weird. I don't have secondary cats, but have vibrant 1792 2 1/2" HF resonators in their place. I also have a 2 1/2" X-pipe in place of the resonator, as I have the sedan. I can say it's fairly quiet at Hwy speeds of 80 mph etc.

mweisdorfer · 12-18-2019, 09:54 AM

Quote:

Originally Posted by Zach1328

I am also running VRSF catless downpipes on an otherwise stock exhaust. It's definitely a bit louder in the mid-range under WOT and is fairly loud on a cold start.

However, if your N54 is THAT loud you may want to confirm the exhaust is bolted up properly and does not have any leaks. A few years ago I somehow lost a bolt off one of the downpipes. It was definitely very very loud when that one DP wasn't bolted securely.

If you didn't have a good seal on one of your downpipes, you'd probably blow a code.

There is a specific one for that issue. I can't remember the exact numbers & letters. I had that problem & fixed it by installing new BMS gaskets & aligning the downpipes to the mid-pipes better. I'm a big fan of the BMS gaskets.

TheMidnightNarwhal · 12-18-2019, 10:43 AM

Quote:

Originally Posted by mweisdorfer

That is weird. I don't have secondary cats, but have vibrant 1792 2 1/2" HF resonators in their place. I also have a 2 1/2" X-pipe in place of the resonator, as I have the sedan. I can say it's fairly quiet at Hwy speeds of 80 mph etc.

That's why he says 4.5k rpm... on the highway you are what 2.8k rpm ish at most around 80 mph.

As soon as you go WOT with the car (I have same exhasut sepcs except x pipe, have stock one) and it hits 3.5 rpm is just screams and then 4.5k rpm almost F1-ish.

This is another reason why I like this car so much, on the highway my car sounds like a prius when crusing but if you give it it goes.

mweisdorfer · 12-18-2019, 11:49 AM

Quote:

Originally Posted by TheMidnightNarwhal

Quote:

Originally Posted by mweisdorfer

That is weird. I don't have secondary cats, but have vibrant 1792 2 1/2" HF resonators in their place. I also have a 2 1/2" X-pipe in place of the resonator, as I have the sedan. I can say it's fairly quiet at Hwy speeds of 80 mph etc.

That's why he says 4.5k rpm... on the highway you are what 2.8k rpm ish at most around 80 mph.

As soon as you go WOT with the car (I have same exhasut sepcs except x pipe, have stock one) and it hits 3.5 rpm is just screams and then 4.5k rpm almost F1-ish.

This is another reason why I like this car so much, on the highway my car sounds like a prius when crusing but if you give it it goes.

I'm at about 2550 rpms doing 80mph. I agree, fairly quite on the Hwy. I have 335is mufflers w/ the flap wide open (basically the PE exhaust).

Yep, you get on it at 80 to get around some dumb@ass doing 70 in the fast lane, it gets loud!!

TheMidnightNarwhal · 12-18-2019, 12:07 PM

Quote:

Originally Posted by mweisdorfer

I'm at about 2550 rpms doing 80mph. I agree, fairly quite on the Hwy. I have 335is mufflers w/ the flap wide open (basically the PE exhaust).

Yep, you get on it at 80 to get around some dumb@ass doing 70 in the fast lane, it gets loud!!

Oh nice didn't know/forgot you also installed a IS muffler.

Are you automatic? At around 74 mph I'm at like 2850RPM but I am manual.

mweisdorfer · 12-18-2019, 12:46 PM

Quote:

Originally Posted by TheMidnightNarwhal

Quote:

Originally Posted by mweisdorfer

I'm at about 2550 rpms doing 80mph. I agree, fairly quite on the Hwy. I have 335is mufflers w/ the flap wide open (basically the PE exhaust).

Yep, you get on it at 80 to get around some dumb@ass doing 70 in the fast lane, it gets loud!!

Oh nice didn't know/forgot you also installed a IS muffler.

Are you automatic? At around 74 mph I'm at like 2850RPM but I am manual.

Yes. Automatic.

On a side note, The 335IS sits higher at 80mph. I have a friend that has one. I think the gearing in the rear diff has a lot to do with it.

RIP_E46COUPEMANUAL · 12-18-2019, 01:33 PM

Can someone PM me have a question about a 335i I want to buy.

Slim415 · 12-18-2019, 04:18 PM

Quote:

Originally Posted by TheMidnightNarwhal

Quote:

Originally Posted by mweisdorfer

That is weird. I don't have secondary cats, but have vibrant 1792 2 1/2" HF resonators in their place. I also have a 2 1/2" X-pipe in place of the resonator, as I have the sedan. I can say it's fairly quiet at Hwy speeds of 80 mph etc.

That's why he says 4.5k rpm... on the highway you are what 2.8k rpm ish at most around 80 mph.

As soon as you go WOT with the car (I have same exhasut sepcs except x pipe, have stock one) and it hits 3.5 rpm is just screams and then 4.5k rpm almost F1-ish.

This is another reason why I like this car so much, on the highway my car sounds like a prius when crusing but if you give it it goes.

Ok thx for the input. Glad I'm not the only 335is that sounds like an F1 car lol. On a cold start in my garage is so damn loud.

type-dRew · 12-19-2019, 07:25 AM

Quote:

Originally Posted by Slim415

Ok thx for the input. Glad I'm not the only 335is that sounds like an F1 car lol. On a cold start in my garage is so damn loud.

MHD flash time options and remove cold start, that will help make it a bit more tolerable.

Slim415 · 12-19-2019, 03:38 PM

Quote:

Originally Posted by type-dRew

Quote:

Originally Posted by Slim415

Ok thx for the input. Glad I'm not the only 335is that sounds like an F1 car lol. On a cold start in my garage is so damn loud.

MHD flash time options and remove cold start, that will help make it a bit more tolerable.

How does that even work?

type-dRew · 12-19-2019, 03:40 PM

Quote:

Originally Posted by Slim415

Quote:

Originally Posted by type-dRew

Quote:

Originally Posted by Slim415

Ok thx for the input. Glad I'm not the only 335is that sounds like an F1 car lol. On a cold start in my garage is so damn loud.

MHD flash time options and remove cold start, that will help make it a bit more tolerable.

How does that even work?

It just doesn't have a cold start rpm. It just starts like a hot start. Falls right to normal idle.

Worked great on my car, made me neighbors hate me less

12-17-2019, 07:40 PM	#1
Slim415 Second Lieutenant 92 Rep 281 Posts Drives: 2011 335is 6MT Join Date: Jul 2019 Location: SF, CA iTrader: (0)	Why is my car so loud? 2011 335is VRSF catless downpipes AFE intake I get that catless DP's are loud but at around 4.5K RPM, it sounds like an F1 car. It has this deafening high pitched note to the exhaust. It's awesome but I never would have expected it to be so effing loud. I wouldn't want to be next to me in a tunnel.
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12-18-2019, 01:49 AM	#4
Zach1328 First Lieutenant 39 Rep 315 Posts Drives: 2008 535i / 2007 335i Join Date: May 2014 Location: United States iTrader: (0)	I am also running VRSF catless downpipes on an otherwise stock exhaust. It's definitely a bit louder in the mid-range under WOT and is fairly loud on a cold start. However, if your N54 is THAT loud you may want to confirm the exhaust is bolted up properly and does not have any leaks. A few years ago I somehow lost a bolt off one of the downpipes. It was definitely very very loud when that one DP wasn't bolted securely. __________________ 07 335i Mods: JB4 + MHD BEF, RB Twos Plus, Phoenix PI Manifold, Dual Walbro 450 LPFP's, DCI, VRSF DP's, VRSF 7.5" FMIC, VRSF CP + TiAL BOV, VRSF inlets & aluminum outlets, TC Kline SA, M3 F/R control arms, M3 subframe bushings
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12-18-2019, 07:04 AM	#5
type-dRew Major 641 Rep 1,245 Posts Drives: 2009 335i xDrive Join Date: Feb 2019 Location: Newport MI iTrader: (0)	An iS has more straight through muffler design, similar to PE mod or M Performance exhaust and being an E92, has no center resonator. So stock, its only source of muffling really comes from the 4 catalytic converters. You deleted the 2 big ones, so you have nearly a straight piped system with 2 cats. Its going to make noise. __________________ 2009 335i xDrive AT / 177k+ miles PSP 750ic / Fuel-It! Stage 1 / BMS CP / Sutphin Tuning / RFP E50 11.61 @ 117.5 New setup; Covid 19Ts on RFP 93 + ARM inlets, dp, VTT cp and PSP outlets
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12-18-2019, 01:33 PM	#12
RIP_E46COUPEMANUAL Registered 0 Rep 3 Posts Drives: E46 COUPE Join Date: Dec 2019 Location: El paso iTrader: (0)	Can someone PM me have a question about a 335i I want to buy.
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