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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 > Quads with Magnaflow mufflers?



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      06-17-2008, 01:22 PM   #1
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Quads with Magnaflow mufflers?

So the inlet/outlet size of the magnaflow muffers are 2.5". What if I were to put quad tips in place with an inlet size of 2.25"? I know that an exhaust shop would use a reducer to install it, but would this affect performance at all? How about sound? Would it just make sense to get quad tips with an inlet size of 2.5"?
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      06-17-2008, 10:06 PM   #2
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Anyone know the answer to this?
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      06-27-2008, 04:25 AM   #3
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Yes, it will affect power. Air flow = power, thus, reduced air flow = reduced power. Air will only flow as fast as the narrowest part of the exhaust will allow. This is an extreme example, but makes the point nonetheless... it doesn't matter if you install 4" pipes throughout your system, cuz if you have bend or any point were it reduces to 2", the entire system will only flow as efficiently as the one 2" section will allow. That's why mandrel-bent piping is always better, cuz it keeps the diameter of the pipes consistent over the entire bend. Unfortunately, Mandrel-bending isn't typical practice for custom fabricaters. Traditional pipe benders (which is what most shops use) essentially pinch the pipe at the bend's apex, thus reducing the actual size.

However, if you got a Y-pipe with a 2.5" inlet and dual 2.25" outlets, that would work fine.
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      06-27-2008, 02:02 PM   #4
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Aftermarket exhaust is mandrel bent, standard. Most higher end car companies do from the factory as well.

OE replacement parts, and stock corrolla / civic pipes, would be crimped.
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      06-27-2008, 02:11 PM   #5
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Quote:
Originally Posted by NoSole View Post
Yes, it will affect power. Air flow = power, thus, reduced air flow = reduced power. Air will only flow as fast as the narrowest part of the exhaust will allow. This is an extreme example, but makes the point nonetheless... it doesn't matter if you install 4" pipes throughout your system, cuz if you have bend or any point were it reduces to 2", the entire system will only flow as efficiently as the one 2" section will allow. That's why mandrel-bent piping is always better, cuz it keeps the diameter of the pipes consistent over the entire bend. Unfortunately, Mandrel-bending isn't typical practice for custom fabricaters. Traditional pipe benders (which is what most shops use) essentially pinch the pipe at the bend's apex, thus reducing the actual size.

However, if you got a Y-pipe with a 2.5" inlet and dual 2.25" outlets, that would work fine.
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Originally Posted by AWD Addict View Post
Aftermarket exhaust is mandrel bent, standard. Most higher end car companies do from the factory as well.

OE replacement parts, and stock corrolla / civic pipes, would be crimped.
The issue is that many quad tips have an inlet size of 2.25"... Is it possible for an exhaust shop to expand the size of the inlet to 2.5"? Not sure if this would weaken the structural integrity of the tips...
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      06-27-2008, 04:37 PM   #6
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what quad tips are you looking at? My Mtech rear bumper is enroute to my bodyshop of choice. I think a custom Magnaflow quad setup will follow shortly after.
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      06-27-2008, 04:40 PM   #7
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what quad tips are you looking at? My Mtech rear bumper is enroute to my bodyshop of choice. I think a custom Magnaflow quad setup will follow shortly after.
I am working on a custom magnaflow setup right now. All in all it costs me ~$560 with tips and everything. All I need is a little section of pipe to go from the mufflers to the secondary cat delete pipes...

You could just get a muffler with a 2.25" inlet and outlet if you want it to be the same....
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      06-27-2008, 04:42 PM   #8
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Originally Posted by e90AW335i View Post
I am working on a custom magnaflow setup right now. All in all it costs me ~$560 with tips and everything. All I need is a little section of pipe to go from the mufflers to the secondary cat delete pipes...

You could just get a muffler with a 2.25" inlet and outlet if you want it to be the same....
yup...you can source the parts yourself off the net pretty cheap. The expensive part is the labor, are you going to weld/bend SS pipes yourself?
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      06-27-2008, 04:44 PM   #9
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Originally Posted by Sniz View Post
yup...you can source the parts yourself off the net pretty cheap. The expensive part is the labor, are you going to weld/bend SS pipes yourself?
Everything is already pre-bent from the supplier. The only part I need bent and welded is a ~2ft section from each of the mufflers to the secondary delete pipes.

I figure material and labor for that cant be more than $150 at a decent shop. Also, there aren't too many bends there so crushed bent it fine as far as that is concerned...
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      06-27-2008, 04:45 PM   #10
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Quote:
Originally Posted by e90AW335i View Post
Everything is already pre-bent from the supplier. The only part I need bent and welded is a ~2ft section from each of the mufflers to the secondary delete pipes.

I figure material and labor for that cant be more than $150 at a decent shop. Also, there aren't too many bends there so crushed bent it fine as far as that is concerned...
oh so your sourcing pre bent SS pipes. Not a bad idea if you think you can fit it all together. Im' assuming you spent a fair bit of time on your back under your car measuring?
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      06-27-2008, 04:47 PM   #11
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Originally Posted by Sniz View Post
oh so your sourcing pre bent SS pipes. Not a bad idea if you think you can fit it all together. Im' assuming you spent a fair bit of time on your back under your car measuring?
I think we are misunderstand each other. I bought Borla cat delete pipes to get me from the DPs to the rear of where the secondary cats were. Then I bought magnaflow mufflers and tips. All I need a shop to do is bend 2ft of piping for each side and weld them up....
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      06-27-2008, 04:52 PM   #12
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Quote:
Originally Posted by e90AW335i View Post
I think we are misunderstand each other. I bought Borla cat delete pipes to get me from the DPs to the rear of where the secondary cats were. Then I bought magnaflow mufflers and tips. All I need a shop to do is bend 2ft of piping for each side and weld them up....

oh gotcha! How much and where did you get the Borla pipes from?
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      06-27-2008, 04:55 PM   #13
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oh gotcha! How much and where did you get the Borla pipes from?
Harold@HP autowerks

I pmed you with the price.
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      06-27-2008, 04:57 PM   #14
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Quote:
Originally Posted by e90AW335i View Post
Harold@HP autowerks

I pmed you with the price.
got it

but responded w/ out seeing your post here. You'll probably respond to my PM before you see this post too.

Thanks.
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