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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 02-17-2010, 12:25 AM   #41
eddiewolfgang
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Originally Posted by iwannagofast View Post
get ebay headers for 150 bucks and keep thestock exhaust on... youll get more power than just putting on a cat back.... it wont be loud at all until your at WOT
can't find headers for M56 engine . If you or anyone in here has an idea or know any performance headers that will do for M56, please let me know.
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Old 02-17-2010, 09:39 AM   #42
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wait till i get my car back from the shop, i'm gonna install some ebay headers i got a few weeks ago if you can wait till i do the install (few days) i might have got the wrong one and you can get mine for cheap cause i'll be buying another i'm almost 100% sure headers will work the exhaust is the same you just have a lower emissions motor has nothing to do with the exhaust manifold. just find out what the stock exhaust manifold part number is and see which set you need. i'll keep ya posted on my headers
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Old 02-18-2010, 03:15 PM   #43
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exactly just like on our cars have a valve in the exhaust that is closed during idle and up to a certain point only to reduce exhaust noise in the cabin. does nothing for performance lol
lol except you're wrong, go pick up a physics book. I'm not talking about exhaust valves, I'm talking about the diameter of the pipe with respect to pressure and velocity. I believe the z06 has this feature too.
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Old 02-19-2010, 10:01 AM   #44
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lol except you're wrong, go pick up a physics book. I'm not talking about exhaust valves, I'm talking about the diameter of the pipe with respect to pressure and velocity. I believe the z06 has this feature too.
Are you sure it's not ferrari?
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Old 02-19-2010, 01:49 PM   #45
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Flow = top end power. Back pressure = low end toqrue... usually. You want to get the best of both worlds. Also like someone mentioned the best way to get gains from exhaust is to make sure it is tuned to the rpm band that the engine uses the best.

M56 motors arent super performers anyway. If u want any noticable power get cams and a tune. Or a supercharger : ). Then get an exhaust.

I heard that even the air boxes/intakes on our BMWs are engineered so well that aftermarket intakes dont make a difference either. GO BMW
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Old 02-19-2010, 03:22 PM   #46
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Originally Posted by IrocThe325i View Post
Flow = top end power. Back pressure = low end toqrue... usually. You want to get the best of both worlds. Also like someone mentioned the best way to get gains from exhaust is to make sure it is tuned to the rpm band that the engine uses the best.

M56 motors arent super performers anyway. If u want any noticable power get cams and a tune. Or a supercharger : ). Then get an exhaust.

I heard that even the air boxes/intakes on our BMWs are engineered so well that aftermarket intakes dont make a difference either. GO BMW
You are an flipping ****, and I'd appreciate it if you didn't post in this thread again.
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Old 02-19-2010, 03:54 PM   #47
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Originally Posted by IrocThe325i View Post
Flow = top end power. Back pressure = low end toqrue... usually.
Explain to me how backpressure helps low end torque?

If you were to say that smaller exhaust pipes create more low end torque but also result in less power at high rpms due to increased backpressure, I would buy that.
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Old 02-20-2010, 03:16 AM   #48
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Explain to me how backpressure helps low end torque?

If you were to say that smaller exhaust pipes create more low end torque but also result in less power at high rpms due to increased backpressure, I would buy that.
Listen to this man. He is very smart.
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Old 02-20-2010, 07:17 AM   #49
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Explain to me how backpressure helps low end torque?

If you were to say that smaller exhaust pipes create more low end torque but also result in less power at high rpms due to increased backpressure, I would buy that.
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Old 02-21-2010, 02:26 PM   #50
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You are an flipping ****, and I'd appreciate it if you didn't post in this thread again.
WHY IM JUST AGREEING WITH YOU!?... i think.

"If you were to say that smaller exhaust pipes create more low end torque but also result in less power at high rpms due to increased backpressure, I would buy that."

Yeh of course. I should have specified why the backpressure was being caused. If theres a potato in your tailpipe i dont think ull be making more toqure

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Old 02-21-2010, 04:23 PM   #51
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Originally Posted by IrocThe325i View Post
Flow = top end power. Back pressure = low end toqrue... usually. You want to get the best of both worlds. Also like someone mentioned the best way to get gains from exhaust is to make sure it is tuned to the rpm band that the engine uses the best.

M56 motors arent super performers anyway. If u want any noticable power get cams and a tune. Or a supercharger : ). Then get an exhaust.

I heard that even the air boxes/intakes on our BMWs are engineered so well that aftermarket intakes dont make a difference either. GO BMW
Completely false, read the link I posted, with analysis and dynos.


Backpressure is never good.
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Old 02-21-2010, 05:29 PM   #52
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i shall read : )
And i was wondering if u knew the best length from headers to put the y-pipe... I think im going to make a full custom cat-back but i want to do it with these concepts that u've brought up.

2" from headers to y-pipe into single 3" with two resonators and a muffler (not sure what kinda yet)...


Nevermind you said closests to the collectors.... ok.

Last edited by IrocThe325i; 02-21-2010 at 05:35 PM.
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Old 02-21-2010, 05:55 PM   #53
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i shall read : )
And i was wondering if u knew the best length from headers to put the y-pipe... I think im going to make a full custom cat-back but i want to do it with these concepts that u've brought up.

2" from headers to y-pipe into single 3" with two resonators and a muffler (not sure what kinda yet)...


Nevermind you said closests to the collectors.... ok.
Yes, unless you have the resources to test for me the optimal distance from the headers
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Old 02-22-2010, 07:33 AM   #54
eddiewolfgang
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Originally Posted by xixixi View Post
wait till i get my car back from the shop, i'm gonna install some ebay headers i got a few weeks ago if you can wait till i do the install (few days) i might have got the wrong one and you can get mine for cheap cause i'll be buying another i'm almost 100% sure headers will work the exhaust is the same you just have a lower emissions motor has nothing to do with the exhaust manifold. just find out what the stock exhaust manifold part number is and see which set you need. i'll keep ya posted on my headers
hey that would be awesome man, i don't know if anyone has ever done that with an M56, but if you happen to be that guy, i'd love to know how it worked. Good luck keep us posted
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Old 02-22-2010, 09:30 AM   #55
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lol no i drive a 330xi with a m54 you need to check the stock part number for your exhaust manifold to see what if anything will work. you could even call bmw
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Old 03-03-2010, 06:14 PM   #56
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I have Headers and the Magnaflow "catback" and i actually felt something after the i put on the Magnaflow.....i can't say how much but something but this setup is sorta loud.
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