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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 Sun, Oct-22-2017, 05:57:58 PM   #1
BMW>Everything
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Default Full 3.5in exhuast

So I plan to get ARH headers with its 3.5in design and want to do a straight pipe system up to section 2 with an EVC, then a quiet street type muffler.

My question is, ARH section 1 has a merger that goes from 3.5 to 2, 2.5in pipes that connect with the stock section 2. Would it make sense to have a Y-pipe with a 3.5in bimmerworld section 2 straight pipe with an evc at the end before section 3 muffler.

Basically going from 3.5 -> Dual 2.5 -> Single 3.5in


Or should I cut the merger in the section 1 before it splits into 2, and make a FULL 3.5in all the way before the muffler?

Which would give more performance?
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Old Sun, Oct-22-2017, 06:03:51 PM   #2
Drewster
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Default Re: Full 3.5in exhuast

Probably the full 3.5
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Old Sun, Oct-22-2017, 06:11:44 PM   #3
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Default Re: Full 3.5in exhuast

PM me
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Old Sun, Oct-22-2017, 06:37:09 PM   #4
BMW>Everything
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Default Re: Full 3.5in exhuast

Would the TTFS tune be worth it for the headers, or just getting custom dyno tune. Can't justify $700 for software....
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Old Sun, Oct-22-2017, 06:39:37 PM   #5
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Default Re: Full 3.5in exhuast

Are you still planning on FI? http://www.m3forum.net/m3forum/showthread.php?t=592966

Worth reading through the entire ARH drama thread before making a decision here. http://www.m3forum.net/m3forum/showthread.php?t=582564
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Old Sun, Oct-22-2017, 06:43:33 PM   #6
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Default Re: Full 3.5in exhuast

Quote:
Originally Posted by m3nt0s View Post
Are you still planning on FI? http://www.m3forum.net/m3forum/showthread.php?t=592966

Worth reading through the entire ARH drama thread before making a decision here. http://www.m3forum.net/m3forum/showthread.php?t=582564
The new testament isn't even that long.....All I really want is a dyno chart to convince me lol
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Old Sun, Oct-22-2017, 06:55:44 PM   #7
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Default Re: Full 3.5in exhuast

Quote:
Originally Posted by BMW>Everything View Post
Would the TTFS tune be worth it for the headers, or just getting custom dyno tune. Can't justify $700 for software....
you would spend more than that on a custom dyno tune.. you pay for the Dyno time plus the tuners time..
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Old Sun, Oct-22-2017, 07:41:43 PM   #8
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Default Re: Full 3.5in exhuast

Also worth mentioning, w/this set up, your power curve will move to the right a little more...
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Old Mon, Oct-23-2017, 12:28:59 AM   #9
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Default Re: Full 3.5in exhuast

Quote:
Originally Posted by BMW>Everything View Post
So I plan to get ARH headers with its 3.5in design and want to do a straight pipe system up to section 2 with an EVC, then a quiet street type muffler.

My question is, ARH section 1 has a merger that goes from 3.5 to 2, 2.5in pipes that connect with the stock section 2. Would it make sense to have a Y-pipe with a 3.5in bimmerworld section 2 straight pipe with an evc at the end before section 3 muffler.

Basically going from 3.5 -> Dual 2.5 -> Single 3.5in


Or should I cut the merger in the section 1 before it splits into 2, and make a FULL 3.5in all the way before the muffler?

Which would give more performance?
There is zero performance benefit to keeping the 1->2->1 in place. The only benefit is it bolts up as is vs time/cost to convert to 3.5" all the way.

Since the dual pipes are roughly the same cross-area as the single, the velocity shouldn't change much so honestly I wouldn't think there'd be a performance difference either way you do it.

The only possible benefit I can think of for going to 3.5" all the way is friction losses from the dual pipes would be higher vs the single pipe.

Sent from my Nexus 6P using Tapatalk
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Old Mon, Oct-23-2017, 01:53:31 AM   #10
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Default Re: Full 3.5in exhuast

Quote:
Originally Posted by BMW>Everything View Post
So I plan to get ARH headers with its 3.5in design and want to do a straight pipe system up to section 2 with an EVC, then a quiet street type muffler.

My question is, ARH section 1 has a merger that goes from 3.5 to 2, 2.5in pipes that connect with the stock section 2. Would it make sense to have a Y-pipe with a 3.5in bimmerworld section 2 straight pipe with an evc at the end before section 3 muffler.

Basically going from 3.5 -> Dual 2.5 -> Single 3.5in


Or should I cut the merger in the section 1 before it splits into 2, and make a FULL 3.5in all the way before the muffler?

Which would give more performance?
BMW Everything,

There's absolutely nothing wrong with the 2-1/2" Y that joins back to a single 3-1/2" in section 2. This will have Zero negative effect on performance I assure you. Run it with confidence.

Nick
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Discussing Full 3.5in exhuast 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)