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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Dual-exhaust conversion on PE



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      04-11-2012, 10:34 PM   #23
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Also want to know if anyone can tell me if doing this could:
1) affect the safety of my car
2) affect the noise of the exhaust
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      04-11-2012, 10:37 PM   #24
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Someone in this forum already did this, it is of course possible but i remember that it ruined the beautiful sound of PE. I would not recommend it.

Here is the thread:
http://www.e90post.com/forums/showthread.php?t=389363

Last edited by tolkino; 04-11-2012 at 10:45 PM.
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      04-12-2012, 12:05 AM   #25
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Quote:
Originally Posted by tolkino
Someone in this forum already did this, it is of course possible but i remember that it ruined the beautiful sound of PE. I would not recommend it.

Here is the thread:
http://www.e90post.com/forums/showthread.php?t=389363
This is exactly what I was thinking, that it will kill the sound and the rasp because of the longer piping and the sharp 90 degree bend.

I might just invest in an mtech rear bumper and diffuser with some new tips or some springs and shocks instead.
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      04-12-2012, 09:21 AM   #26
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Damn.. I don't know what to do now.
Theoretically, it's not supposed to change the sound, is it?
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      04-12-2012, 09:39 AM   #27
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Quote:
Originally Posted by Gjm127
Damn.. I don't know what to do now.
Theoretically, it's not supposed to change the sound, is it?
You'd have to incorporate some pretty extreme bends for an the task you want complete ..your better of selling ur PE muffler keeping the midpipes n just getting a decent magnaflow with custom piping allowing better flow to the passenger side, or just keep it OE.
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      04-12-2012, 11:06 AM   #28
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http://www.i.imgur.com/KtYcm.jpg

Here's what we're doing.
Any thoughts on sound changes, performance and safety???
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      04-12-2012, 02:17 PM   #29
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Quote:
Originally Posted by Gjm127
http://www.i.imgur.com/KtYcm.jpg

Here's what we're doing.
Any thoughts on sound changes, performance and safety???
I'm going to see how it turns out for you.

If you end up doing it, post up a sound clip!

It shouldn't make a huge difference but idk if it's worth getting a new bumper, diffuser, paying labor and parts fee for the custom pipes, and on top of that risking that awesome sound.

I'm ordering some Cyba tips soon.
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      04-12-2012, 04:32 PM   #30
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Quote:
Originally Posted by Gjm127 View Post
http://www.i.imgur.com/KtYcm.jpg

Here's what we're doing.
Any thoughts on sound changes, performance and safety???
you definitely wont have enough room to double stack the pipes one behind the other like that. unless you use ridiculously skinny piping.

stacking them on top of each other might be a better idea. use the right PE outlet to go to the left bumper cutout, and route the left PE outlet over the other pipe to go to the right bumper cutout. see my drawing at the bottom.

either way it's going to be super restrictive and will likely dampen noise due to the bends and longer piping. on my dual exhaust there's definitely less flow and less sound coming out of the right side.

performance might take a hit due to the increase in restriction of flow, but might not be noticeable unless you dyno it.

safety shouldnt be affected. it's just an exhaust, not a safety structure. in an accident it will just get crushed or bent.
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      04-13-2012, 09:38 AM   #31
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Quote:
Originally Posted by VTECaddict
Quote:
Originally Posted by Gjm127 View Post
http://www.i.imgur.com/KtYcm.jpg

Here's what we're doing.
Any thoughts on sound changes, performance and safety???
you definitely wont have enough room to double stack the pipes one behind the other like that. unless you use ridiculously skinny piping.

stacking them on top of each other might be a better idea. use the right PE outlet to go to the left bumper cutout, and route the left PE outlet over the other pipe to go to the right bumper cutout. see my drawing at the bottom.

either way it's going to be super restrictive and will likely dampen noise due to the bends and longer piping. on my dual exhaust there's definitely less flow and less sound coming out of the right side.

performance might take a hit due to the increase in restriction of flow, but might not be noticeable unless you dyno it.

safety shouldnt be affected. it's just an exhaust, not a safety structure. in an accident it will just get crushed or bent.
Hey thanks for the idea! It looks like a better alternative, I already took the before pictures.

I'm going to see a much more legitimate mechanic and he'll te me what he thinks is best.

I know this is weird but I've seen high-end exhaust setups have their pipes connected in an X. If possible, should I try merging both outs before they reach the bumper cutouts?
It could make up for the lost sound in extended piping.
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      04-13-2012, 11:30 AM   #32
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Why don't you just mount two dummy tips where the second set of pipes come out? That way it'll look like you have a quad set-up and it won't affect the beautiful sound of the PE. No one will know.
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      04-13-2012, 12:25 PM   #33
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Quote:
Originally Posted by TSM330i
Why don't you just mount two dummy tips where the second set of pipes come out? That way it'll look like you have a quad set-up and it won't affect the beautiful sound of the PE. No one will know.
I already thought of doing this.
But live in Montreal...
Cold Weather = you can see the smoke come out of the tips.
+ I'd still have to reroute the piping by a bit cuz the cutouts are more inward.
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      04-18-2012, 10:35 AM   #34
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Update: I'm waiting on JGMODS for me to pay him. My mechanic gave me the thumbs up for the project!
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      04-18-2012, 04:45 PM   #35
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Quote:
Originally Posted by Gjm127 View Post
Update: I'm waiting on JGMODS for me to pay him. My mechanic gave me the thumbs up for the project!
Waiting on pilot to email me back a quote and it will be on its way
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      04-19-2012, 06:31 PM   #36
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Nice dude!

Can't wait to see how it comes out. Definitely do a thorough review so I can get inspired enough to do it!
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      04-20-2012, 09:38 AM   #37
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Quote:
Originally Posted by DesiRoc
Nice dude!

Can't wait to see how it comes out. Definitely do a thorough review so I can get inspired enough to do it!
It's all been paid, just waiting for them to ship my package. I should get it next week and get the job done by the end if next week.

I'll update you with pictures, video and my review

Just wondering though, what are the PE components? What (resonator, cats.. ) can I delete if I ever want the sound to be louder?
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      04-24-2012, 08:54 AM   #38
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Quote:
Originally Posted by Gjm127 View Post
It's all been paid, just waiting for them to ship my package. I should get it next week and get the job done by the end if next week.

I'll update you with pictures, video and my review

Just wondering though, what are the PE components? What (resonator, cats.. ) can I delete if I ever want the sound to be louder?
I'm pretty sure the PE already comes with a resonator delete. Can't remember where I read that.
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      04-26-2012, 02:11 PM   #39
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That is exactly what I have on my mind also. I would really like to have the 335 setup with a mtech rear
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      04-26-2012, 06:55 PM   #40
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Conversion

I don't have the PE exhaust but I did do the conversion with a magnaflo exhaust. Good luck, wanna see how it turns out.pics are so you can see the difference in the position of the muffler
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      04-26-2012, 11:56 PM   #41
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Quote:
Originally Posted by Bruce li View Post
I don't have the PE exhaust but I did do the conversion with a magnaflo exhaust. Good luck, wanna see how it turns out.pics are so you can see the difference in the position of the muffler
Looks awesome man, thanks for the pics, I'll post mine once my package gets here!!
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      05-02-2012, 11:52 AM   #42
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My parts are here, car is in garage...
Waiting game has started!

We decided on painting the diffuser in sparkling graphite, the rest of my car is Jet Black.
Do you think it's a good idea? Would the contrast look good?

Also, the 328i PE tips.. Are they as big as the 335i PE tips? Should I change them?
Any ideas?
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      05-02-2012, 03:53 PM   #43
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Quote:
Originally Posted by Bruce li View Post
I don't have the PE exhaust but I did do the conversion with a magnaflo exhaust. Good luck, wanna see how it turns out.pics are so you can see the difference in the position of the muffler
How much did this cost for the piping+muffler+installation?

Thanks.
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      05-02-2012, 07:26 PM   #44
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$320
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