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      09-04-2016, 11:01 PM   #1
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To dual or not to dual

Thoughts on dual/quad exhausts on 328s? I know most 335 owners will disapprove. What cons are there to it though, performance wise?
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      09-04-2016, 11:04 PM   #2
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No performance gains, and you'll need a completely custom exhaust.

That said, I love mine. The reason I did it is I wanted that diffuser badly. They only came in dual setups so I went the whole way with the conversion

http://www.e90post.com/forums/showthread.php?t=918867
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      09-04-2016, 11:31 PM   #3
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Did you replace your whole rear bumper?
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      09-05-2016, 12:21 AM   #4
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Yes I did, I wanted the M sport bumper. But if you already have the m sport bumper you only need to change the diffuser.
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      09-05-2016, 12:35 AM   #5
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Quote:
Originally Posted by Blindside_137
Yes I did, I wanted the M sport bumper. But if you already have the m sport bumper you only need to change the diffuser.
How much did it cost you in total?
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      09-05-2016, 01:00 AM   #6
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Well the bumper and paint work was over 1k but the exhaust work was pretty cheap, 200 to set up the pipes and 150 for my tips from cyba on the forum
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      09-05-2016, 09:05 AM   #7
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I wouldn't, don't care if 335 or not but think that money could be better spent on other mods that actually provide performance gains/benefit
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      09-05-2016, 09:27 AM   #8
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There is very little performance to be gained from the 328i. I'm very happy with my money spent. Everybody has different plans and ideas for their cars which is what makes modding great.
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      09-05-2016, 09:42 AM   #9
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Quote:
Originally Posted by Blindside_137 View Post
There is very little performance to be gained from the 328i. I'm very happy with my money spent. Everybody has different plans and ideas for their cars which is what makes modding great.
and you removed the 328 emblem while you were at it.

I think that is where most 335 guys have a problem with , when they install dual exhaust and remove the 328 emblem...

at the end of the day is your car, if you are happy with it then who cares

BTW they do make diffusers for mtech sport bumper with one hole, maybe not the same one you have
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      09-05-2016, 10:05 AM   #10
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Quote:
Originally Posted by rick100
Quote:
Originally Posted by Blindside_137 View Post
There is very little performance to be gained from the 328i. I'm very happy with my money spent. Everybody has different plans and ideas for their cars which is what makes modding great.
and you removed the 328 emblem while you were at it.

I think that is where most 335 guys have a problem with , when they install dual exhaust and remove the 328 emblem...

at the end of the day is your car, if you are happy with it then who cares

BTW they do make diffusers for mtech sport bumper with one hole, maybe not the same one you have
I always find it funny how uptight people get about emblems and such. Not saying you are. But people go crazy over M badges on non-M cars when BMW is now putting M badges on non-M cars.

I took my badge off because it looks clean, about a year before I did the conversion. If people really care that I'm trying to fake it as a 335 then they can go ahead and get upset. I love my car and what it is. I also have M3 mirrors, M359 wheels, and M3 side skirts. I'm sure M3 guys might get pissed I really have no idea. But not a single thing done on my car is for anyone else to like, it's for me.

And again, I said earlier the diffuser I wanted only came in dual. It's a full carbon performance diffuser from duke dynamics. No company other than them was making carbon diffusers back when I did this 3 years ago. Now of course there might be more options, but not when I was looking. Believe me, I looked. Can we please help the OP with the question instead of providing off topic discussions on my car?
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      09-05-2016, 10:28 AM   #11
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Dual/quad conversion is fine. There will always be haters, but as long as you don't fake-badge your car, debadging it is fine too.

As said, YOUR car, do what makes you happy!

Looks like that previous poster did a muffler delete into dual outs. If you want to keep a muffler (OEM or other), it may be difficult to do, limited space.
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      09-05-2016, 10:46 AM   #12
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Quote:
Originally Posted by Ali-323i
Dual/quad conversion is fine. There will always be haters, but as long as you don't fake-badge your car, debadging it is fine too.

As said, YOUR car, do what makes you happy!

Looks like that previous poster did a muffler delete into dual outs. If you want to keep a muffler (OEM or other), it may be difficult to do, limited space.
Correct

There are some people who keep the stock exhaust (or get some type of magnaflow) and route one short pipe to the driver side, and one long pipe to the passenger side (see link and images). My muffler shop said this wasn't ideal for 2 reasons.

The first is that my tips were too long, so the 90 degree bends involved with the pipes for this wouldn't work out.

The second is that one pipe being short, and another long might have altered the flow of exhaust gases and possibly hurt performance.

For my car they recommended the y pipe to have a built in splitting section to divide the exhaust gas flow evenly into both pipes. But with this setup I had to relocate my charcoal evap canister.

http://www.e90post.com/forums/showthread.php?t=557918
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      09-05-2016, 11:00 AM   #13
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Quote:
Originally Posted by Blindside_137 View Post
I always find it funny how uptight people get about emblems and such. Not saying you are. But people go crazy over M badges on non-M cars when BMW is now putting M badges on non-M cars.

I took my badge off because it looks clean, about a year before I did the conversion. If people really care that I'm trying to fake it as a 335 then they can go ahead and get upset. I love my car and what it is. I also have M3 mirrors, M359 wheels, and M3 side skirts. I'm sure M3 guys might get pissed I really have no idea. But not a single thing done on my car is for anyone else to like, it's for me.

And again, I said earlier the diffuser I wanted only came in dual. It's a full carbon performance diffuser from duke dynamics. No company other than them was making carbon diffusers back when I did this 3 years ago. Now of course there might be more options, but not when I was looking. Believe me, I looked. Can we please help the OP with the question instead of providing off topic discussions on my car?
you already provided op with all the help he needs

Dual exhaust does not provide any significant gains and it is mostly for looks. Sound wise , it does not really get any better than just adding a PE exhaust so again single exhaust is just fine. Resale wise I would think single tip is the way to go too . Again we come down to just looks which is fine , nothing wrong with that, I ve done cosmetic mods to my car just for looks too just like most people here.

As for what people think , that does not really matter as long as op likes it .

True to be told is the non BMW guys would confuse your car for a 335 specially if the badge is removed and they would probably like it and think it's 335 performance, . However the BMW crew , specially the 335 ( at least most) crew is going to think you are a poser for having dual exhaust with badge removed.t hat's just the way it is. I find the 335 crew to be pretty uptight when it comes down to this type of stuff

I'm just trying to be dead honest with OP here. Personally I would not do it just because I would feel like I m trying to pretend that I drive a 335 even though I have a 328 . If I ever do that I would probably keep the badge just because ...

At the end of the day if Op likes it , then who really cares. I think it looks good but I would not do it to my car for the reasons stated, personal preference
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