[evan_lala]

I'm looking to improve the sound of my 2009 e92 335i, currently the car is completely stock. I am considering doing a form of the BMW Performance Exhaust mod found here: https://www.e90post.com/forums/showthread.php?t=739970
However, rather than doing the modification on both the driver and passenger side I would like to do the straight pipe on just the drivers side. That way I can use the ExhaustMeister valve controller found here: http://exhaustmeister.com to control the flow through the OEM perforated pipe when cold starting and pulling into my house late at night: this aspect is very important to me as I often need to leave early without waking up my roommates. This setup would be similar to the one found in this video minus the catless downpipes:

Does anyone else have experience with a similar exhaust setup? I'm curious if there is a sizable change in sound from stock without the downpipes or if it will sound only slightly louder than stock even with the valve open. Also, does anyone know if the driver's side of the e92 mufflers contain a resonator or perforated pipe? Thanks!

[Monty.335i]

I had also thought about getting a valve controller before doing the PE Mod, but the car isn't really that much louder IMO especially if you even out the Muffler packing (fiberglass) to both sides. I would definitely look into getting cold-start delete (via MHD) if you worried about loud start ups, it's a world of difference. I'm also Catless.

There is a resonator on the driver side.

[SSW]

I use the Exhaustmeister w/stock pipes on my 335i .

I leave them open all the time and they sound fine to me. Really don't think you need to do anything else.