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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > The Half PE Mod [Video]



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      11-24-2019, 07:23 PM   #1
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The Half PE Mod [Video]

It's the half PE mod because only the driver's side muffler has been modified.

Inside the muffler, both resonator and perforated pipe were replaced with straight pipes, all exhaust packing re-used. With the exhaust flap open the car becomes significantly louder, and with the exhaust flap closed all exhaust is routed through the untouched passenger side muffler resulting in a stock-like, quieter sound. I purchased a valve controller in order to allow me to switch at the click of a button.

Flap closed it sounds exactly like when you first got your car. Quiet, no cabin drone, barely noticeable to those around you.

Flap open at idle you can actually hear the turbo from the exterior. In the cabin, the exhaust is noticeable after 2.3K RPM and after that it is very obvious your exhaust is modified. No rattles, no obnoxious drone, just a hum. Very pleasing to listen to while daily driving. Outside the car the exhaust is noticeable at every RPM, but becomes significantly (not obnoxiously) louder passed that 2.3K mark. At WOT my friends have said that it sounds absolutely amazing. It is a notch or two quieter than a full muffler delete.

Half PE Mod- $185
Valve controller- $90

I love this setup because you get to decide when you want the car quiet or loud.

Soon I will flash with MHD and show how the car sounds flap open with burbles.

I know the wind is annoying, the next video will be without it.
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      11-24-2019, 08:08 PM   #2
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Question about these valve controllers-

I recall my old 335i (N54) stock valve behavior upon start up was that the valve stayed open for a split second before closing (as if the engine had to build vacuum).

Is this the case with the controller? Or can the valve be closed before the engine starts, avoiding a split second of open valve operation
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      11-24-2019, 09:26 PM   #3
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Quote:
Originally Posted by drunkenup View Post
Question about these valve controllers-

I recall my old 335i (N54) stock valve behavior upon start up was that the valve stayed open for a split second before closing (as if the engine had to build vacuum).

Is this the case with the controller? Or can the valve be closed before the engine starts, avoiding a split second of open valve operation
With this controller, the valve remains in the open position at every start up. If you want a quiet cold start you have to press the close button right after starting the car.
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      11-25-2019, 02:21 PM   #4
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Quote:
Originally Posted by drunkenup View Post
Question about these valve controllers-

I recall my old 335i (N54) stock valve behavior upon start up was that the valve stayed open for a split second before closing (as if the engine had to build vacuum).

Is this the case with the controller? Or can the valve be closed before the engine starts, avoiding a split second of open valve operation
The factory valve is default closed. To have it closed for cold start you need to swap the valve to a default closed position unit, which is what I plan on doing since i've done the same exhaust mod as OP. Cold start is awful loud and even if I grab the button right away its already too much. And I haven't even done downpipes yet.
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      12-06-2019, 01:01 AM   #5
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How has it been so far? Looking into doing this as well.
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      12-06-2019, 10:52 AM   #6
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Originally Posted by r335i View Post
How has it been so far? Looking into doing this as well.
It has been worth every penny. I only close the valve on road trips. Even above 2K there is no rattle, weird vibrations, drone, etc. Having the valve has just made it easier to control the sound of the car for different situations i.e neighborhood, kids in car, long drives. Now it sounds really good, but I bet with a downpipe it will sound even better.
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      12-07-2019, 08:33 PM   #7
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Quote:
Originally Posted by balkanbemve View Post
It has been worth every penny. I only close the valve on road trips. Even above 2K there is no rattle, weird vibrations, drone, etc. Having the valve has just made it easier to control the sound of the car for different situations i.e neighborhood, kids in car, long drives. Now it sounds really good, but I bet with a downpipe it will sound even better.
That's great to hear, glad you enjoy it man. Where did you get the valve controller for $90 as mentioned in the post?

Im surprised there's no drone!

Edit: When do you plan on getting the tune to add in the burbles - would love to see a video of it too.
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      12-10-2019, 09:14 PM   #8
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Quote:
Originally Posted by r335i View Post
Quote:
Originally Posted by balkanbemve View Post
It has been worth every penny. I only close the valve on road trips. Even above 2K there is no rattle, weird vibrations, drone, etc. Having the valve has just made it easier to control the sound of the car for different situations i.e neighborhood, kids in car, long drives. Now it sounds really good, but I bet with a downpipe it will sound even better.
That's great to hear, glad you enjoy it man. Where did you get the valve controller for $90 as mentioned in the post?

Im surprised there's no drone!

Edit: When do you plan on getting the tune to add in the burbles - would love to see a video of it too.
The controller is from valvetronic, I believe its the only plug and play on the market right now. MHD I'll hopefully do in the spring.
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      01-14-2020, 03:38 PM   #9
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Quote:
Originally Posted by balkanbemve View Post
The controller is from valvetronic, I believe its the only plug and play on the market right now. MHD I'll hopefully do in the spring.
Would you honestly have been fine without doing the controller? Like would you say its not too loud even when cruising the highway or something. Thanks again lol.
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      01-14-2020, 06:34 PM   #10
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I did the same thing to my car when I had it. Exhaust is otherwise stock (cats are all there) except for the PE mod on the driver side. Here's a clip with MHD burbles at medium aggressiveness. I have idle revs too but only a sound clip no video.



I basically had the valve open all the time. The difference between open and closed is very little inside the car and can really only be noticed when the windows are up and you have no radio on. There's a tiny bit of drone with the valve open, nothing like a muffler delete. Outside of the car there is a noticeable difference between open and closed especially with the burbles.

I still have the ExhaustMeister valve controller which works just like the Valvetronic one but a bigger box. PM me if you're interested.
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