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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 > *** PDF GUIDE - Modify OEM exhaust to sound like PE exhaust ***



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      04-24-2014, 07:51 PM   #1
Glowin
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*** PDF GUIDE - Modify OEM exhaust to sound like PE exhaust ***

I thought I'd post this up as a new thread so it's easy for people to find, as it's currently buried in the original one (http://www.e90post.com/forums/showthread.php?t=739970), in post 1094, and the OP of that thread does not seem to visit much anymore to update his first post with this guide.

Cheers.
.

Last edited by Glowin; 03-04-2015 at 02:25 PM.
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      04-24-2014, 08:26 PM   #2
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this should be a sticky somewhere. Maybe DIY
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      04-29-2014, 11:34 PM   #3
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Bump. In case the mods can insert my guide into the first post of the original thread, then go for it, and we can delete this one.
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      04-30-2014, 03:46 PM   #4
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Great guide, I say STICKY!
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      05-06-2014, 08:10 PM   #5
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      07-04-2014, 09:14 PM   #6
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Bump for those who've missed this.

MODS - Can you insert my PDF into the first post of the original thread, so it's all in one place? I've linked it in my first post.
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      07-07-2014, 01:54 PM   #7
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Great contribution! Should definitely be Sticky'd.
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      11-25-2014, 07:24 PM   #8
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Bump for this.
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      02-19-2015, 09:51 PM   #9
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Sounds great with the passenger side only too

Here's my update, finally, after finding a place who would do it!

I was having a hard time finding a shop who either wanted to do the mod (lots of them said it's a stupid idea) or didn't want to charge me like 7 hours of labor....

I found a muffler shop who would do it for $250. I only did the passenger side though, and it came out pretty good. And here's the logic I used as to why I only went pass side, besides not wanting to spend $400.

If you look at the pics in the PDF guide I put together, you'll see the driver's side already isn't just a perforated pipe like the pass side. There's a canister of sorts, which has some sound insulating properties I'm guessing. But you know it's louder than just a perforated pipe, because A) the valving system is designed to up up that muffler for more noise, and B) it's already proven that putting more exhaust gases thru that side is louder - hence why everyone does the "golf tee" mod to it.

This is what I found with just the pass side done. If I leave the driver's side valve as normal, most exhaust gases go thru the pass side, which now has a straight pipe. It's darn loud! Around 5000 to 5500 RPM on low throttle input (like a steady speed or very slow acceleration), you get some rasp / high pitched sounds. But if you accelerate quickly, it's a nice growl around that range as well, as the driver's side also opens up.

If you leave the exhaust valve open always (golf tee mod), then some gas goes thru the driver's side always, and it mellows out the overall sound a little bit, but is still much louder than stock. I went with this setup in the end, but can easily go back to the louder setup anytime I want by just plugging back in the exhaust valve.
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      03-04-2015, 02:25 PM   #10
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Bump for those who can't find this.
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      03-04-2015, 05:26 PM   #11
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Thanks for sharing. Added to favorites!!!
Please post a Video of your single side sound.
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Last edited by dicostal; 03-04-2015 at 05:33 PM.
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      04-20-2015, 11:34 AM   #12
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Quote:
Originally Posted by Glowin View Post
I thought I'd post this up as a new thread so it's easy for people to find, as it's currently buried in the original one (http://www.e90post.com/forums/showthread.php?t=739970), in post 1094, and the OP of that thread does not seem to visit much anymore to update his first post with this guide.

Cheers.
.
Hey man, so I'm going to do this on my E92 this weekend or next, my question to you is, whats your opinion on deleting the secondary cats. I have VRSF Downpipes right now and if I'm going to do this PE Mod do you think it would make it TOO loud or would deleting them be a good move.
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      06-27-2015, 11:37 AM   #13
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Bump for new people discovering this great mod.

Out of curiosity, has anyone here had to go back to stock, or thought about how they'd do it? I'll most likely trade my car to the dealer, who I can't imagine will want it this loud. What have people done?

Seems like a PITA to chop it off and trade it for stock. Plus, the car would sit for like a week until the other exhaust comes back...

I was thinking I'd have to take it back to the shop, have them take off the exhaust, cut it back open again, and drill some holes in the solid piping to replicate the old perforated pipe. Or would that not do the trick?
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