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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Feb-15-2017, 08:11:59 PM   #31
HassanEido
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Default Re: My custom exhaust journy begins

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Originally Posted by bmw m3 s50 View Post
Honestly, I don't think you will need dual 3". A true 2.5" will flow pretty good. Remember, when it comes to exhaust, it is not all about pipe size. The way the the entire system interacts with each part is the biggest factor with making power and sound.
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Old Wed, Feb-15-2017, 11:48:48 PM   #32
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Default Re: My custom exhaust journy begins

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Originally Posted by bmw m3 s50 View Post
Honestly, I don't think you will need dual 3". A true 2.5" will flow pretty good. Remember, when it comes to exhaust, it is not all about pipe size. The way the the entire system interacts with each part is the biggest factor with making power and sound.
I think maybe you misinterpreted Hassan's post (or maybe I'm misinterpreting it-lol), but I think he was saying that dual 3" pipes might be beneficial to a turbo set up...not necessarily an NA set up. Dual 2 1/2" pipes would certainly be adequate for an NA car and maybe even some lower boost/lower powered FI cars.
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Old Wed, Feb-15-2017, 11:53:03 PM   #33
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Default Re: My custom exhaust journy begins

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Originally Posted by HassanEido View Post
Seen that video series before (there's also one that pits a cheap muffler against a more expensive and freer flowing muffler), and again...I think dual 2 1/2" pipes are probably good to around 500hp. After that, agreed, stepping up to dual 3" (or a large single) is the way to go! I really feel like we're all saying the same thing here-lol
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Old Thu, Feb-16-2017, 03:31:15 AM   #34
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Default Re: My custom exhaust journy begins

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Originally Posted by stash1 View Post
Seen that video series before (there's also one that pits a cheap muffler against a more expensive and freer flowing muffler), and again...I think dual 2 1/2" pipes are probably good to around 500hp. After that, agreed, stepping up to dual 3" (or a large single) is the way to go! I really feel like we're all saying the same thing here-lol
I have been around plenty of V8 cars that run dual 2.5" piping and pump out 500+. It's often not till you're over 300hp per pipe that dual 3" makes sense. The previously linked video is good showing the differences.

The analogy I often use is connecting a fire hose to your sink faucet. Sure, that's free flowing, but the velocity is gone. So if OP is turbo'd and putting out 600+ it may make sense. Though most of the time it seems too many people use their "logic" rather than science when it comes to exhaust.
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Old Thu, Feb-16-2017, 03:56:03 AM   #35
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Default Re: My custom exhaust journy begins

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I have been around plenty of V8 cars that run dual 2.5" piping and pump out 500+. It's often not till you're over 300hp per pipe that dual 3" makes sense. The previously linked video is good showing the differences.

The analogy I often use is connecting a fire hose to your sink faucet. Sure, that's free flowing, but the velocity is gone. So if OP is turbo'd and putting out 600+ it may make sense. Though most of the time it seems too many people use their "logic" rather than science when it comes to exhaust.
Ya, I wasn't saying that you can't make over 500 hp w/2 1/2" pipes (made 650+ in my old 9 sec 5.0 back in the day w/2 1/2" pipes). Still currently have an 11 sec 1970 Pontiac GTO w/a built 455, so yeah...very familiar w/'old' V8's-lol. Science is great, but doesn't always apply in the 'real world' when it comes to what works and what doesn't...experience still counts for something.
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Old Thu, Feb-16-2017, 05:04:45 AM   #36
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Default Re: My custom exhaust journy begins

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Originally Posted by djjvr View Post
I have been around plenty of V8 cars that run dual 2.5" piping and pump out 500+. It's often not till you're over 300hp per pipe that dual 3" makes sense. The previously linked video is good showing the differences.

The analogy I often use is connecting a fire hose to your sink faucet. Sure, that's free flowing, but the velocity is gone. So if OP is turbo'd and putting out 600+ it may make sense. Though most of the time it seems too many people use their "logic" rather than science when it comes to exhaust.
I think you misinterpreted my reply I was recommending dual 3 inch to you , IF you are over 500 whp, since that puts you close to 600 crank hp.. I would never run dual 3s on an NA car, an s54 m3 anyway
I only mentioned this since you noted you had 3.5 inch single, which I belive doesn't flow enough on an FI car
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Old Thu, Feb-16-2017, 11:27:49 AM   #37
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Default Re: My custom exhaust journy begins

Some WOT action for you guys.
Outside the cabin all you hear is the glorious muffler, inside at 3k there's a hit of rasp, very samll, minute even. I got catless headers after all and only one res. But to my ears sounds great Camera doesn't do it justice to be honest, but here goes.
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Old Thu, Feb-16-2017, 01:51:38 PM   #38
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Default Re: My custom exhaust journy begins

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Originally Posted by stash1 View Post
Ya, I wasn't saying that you can't make over 500 hp w/2 1/2" pipes (made 650+ in my old 9 sec 5.0 back in the day w/2 1/2" pipes). Still currently have an 11 sec 1970 Pontiac GTO w/a built 455, so yeah...very familiar w/'old' V8's-lol. Science is great, but doesn't always apply in the 'real world' when it comes to what works and what doesn't...experience still counts for something.
Gotcha. By the way sounds like some cool cars!

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Originally Posted by HassanEido View Post
I think you misinterpreted my reply I was recommending dual 3 inch to you , IF you are over 500 whp, since that puts you close to 600 crank hp.. I would never run dual 3s on an NA car, an s54 m3 anyway
I only mentioned this since you noted you had 3.5 inch single, which I belive doesn't flow enough on an FI car
Ah, I might have as it seems like we are in agreement.
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Old Thu, Feb-16-2017, 06:48:59 PM   #39
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Default Re: My custom exhaust journy begins

Alright
Finally booked some dyno time:348.4 whp
image.png

My pre dyno was 339 whp
Screenshot_20170216-214548.jpg
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Old Thu, Feb-16-2017, 07:32:59 PM   #40
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Default Re: My custom exhaust journy begins

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Originally Posted by HassanEido View Post
Alright
Finally booked some dyno time:348.4 whp
Attachment 201920

My pre dyno was 339 whp
Attachment 201921
Awesome dude! So, you def picked up a few HP from just the muffler change then-right???

EDIT: That's some crazy torque too! Why are your HP/Torque lines not intersecting at 5,250rpm's? Scaling may be off slightly?
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Discussing My custom exhaust journy begins in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)