Need Quad Conversion Help
#1
Hey everyone,
so i've been researching a few ideas to do the quad exhaust conversion for my 525i... however i've been reading stories about losing low end torque/back pressure because the engine is not set up as a "V"? I'm merely looking to do it for cosmetics and sound-wise and I wouldnt mind having the car breathe a little better without sacrificing low-end torque. Is the loss of back pressure/low end torque due to the fact that you would be running 2 mufflers instead of one? I'm confused as to what exactly causes the drop in torque.
So what I did was configure a mock up diagram utilizing 1 muffler and extending the outlets to the quad tips (OPTION 1 in diagram) - It's a symmetrical design. If this is a silly idea then I would opt for (OPTION 2)?
If OPTION 1 is a possibility to NOT lose low end torque but still get the quad look + deep sound, then I would also need to know the exact dimensions of the muffler I could use in that space.
Also do I absolutely NEED the X-pipe?
Please help!
Need dimensions for this area here so I can get the proper sized muffler:
so i've been researching a few ideas to do the quad exhaust conversion for my 525i... however i've been reading stories about losing low end torque/back pressure because the engine is not set up as a "V"? I'm merely looking to do it for cosmetics and sound-wise and I wouldnt mind having the car breathe a little better without sacrificing low-end torque. Is the loss of back pressure/low end torque due to the fact that you would be running 2 mufflers instead of one? I'm confused as to what exactly causes the drop in torque.
So what I did was configure a mock up diagram utilizing 1 muffler and extending the outlets to the quad tips (OPTION 1 in diagram) - It's a symmetrical design. If this is a silly idea then I would opt for (OPTION 2)?
If OPTION 1 is a possibility to NOT lose low end torque but still get the quad look + deep sound, then I would also need to know the exact dimensions of the muffler I could use in that space.
Also do I absolutely NEED the X-pipe?
Please help!
Need dimensions for this area here so I can get the proper sized muffler:
#3
Contributors
Joined: Mar 2007
Posts: 5,434
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From: NYC, Rego Park, Queens
My Ride: 2004 E60 530i, 2012 E70 X5 35i
Model Year: 2004
Originally Posted by Speed_Force_E60' post='716478' date='Nov 9 2008, 05:19 PM
Ultimately the set up would look similar to this but utilizing only 1 muffler instead of 2. Does this make sense? or ridiculous?
But its been done. I believe Anthony517 did it too on his e60. Look for his postings and you can see.
#4
Originally Posted by nigxdoof' post='716496' date='Nov 9 2008, 06:54 PM
I believe MacFly's car has the setup you are looking for, Ask him for a PM and he can tell you what he used.
But its been done. I believe Anthony517 did it too on his e60. Look for his postings and you can see.
But its been done. I believe Anthony517 did it too on his e60. Look for his postings and you can see.
BTW, where did you get your Eisermann tips? I think im leaning towards the oval tips just like yours.
Thanks!
#5
Contributors
Joined: Mar 2007
Posts: 5,434
Likes: 0
From: NYC, Rego Park, Queens
My Ride: 2004 E60 530i, 2012 E70 X5 35i
Model Year: 2004
Actually, Anthony517's setup is the one you want,
http://forums.e60.net/index.php?showtopic=49606&hl=
Take a look at his thread.
And the tips, I got from Evsmotors.com. Call up ted and ask for the M6 oval tips. He'll let you know what's up. Or you can go 2 AAA motor in cali. I know a lot of guys here went to them for exhaust work.
http://forums.e60.net/index.php?showtopic=49606&hl=
Take a look at his thread.
And the tips, I got from Evsmotors.com. Call up ted and ask for the M6 oval tips. He'll let you know what's up. Or you can go 2 AAA motor in cali. I know a lot of guys here went to them for exhaust work.
#8
Contributors
Joined: Mar 2007
Posts: 5,434
Likes: 0
From: NYC, Rego Park, Queens
My Ride: 2004 E60 530i, 2012 E70 X5 35i
Model Year: 2004
Originally Posted by Speed_Force_E60' post='716548' date='Nov 9 2008, 08:42 PM
This magnaflow muffler should work right? It's dual in and dual out. I just want to make sure the muffler size is ok to use.
#9
Contributors
Joined: Aug 2005
Posts: 2,114
Likes: 0
From: Houston, Texas
My Ride: 2005 BMW 545i, Silver Grey, Sport Package, R. Shades, Cold Pkg, Sat. Rad., Prem. Sound.
Originally Posted by nigxdoof' post='716554' date='Nov 9 2008, 07:46 PM
I believe so.
#10
Originally Posted by Bimmer32' post='716572' date='Nov 9 2008, 08:15 PM
2.5 OD might be too big for your setup. Try 2 to 2.25 only. The more mufler you use, the less loud and less droning you will get.