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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 Tue, Oct-31-2017, 02:47:54 PM   #31
WyattH
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Default Re: American racing headers Results

Thanks for sharing.
Peak gains of 23-25whp, starting around 5K from the headers alone. Nice gains, and cool that you tune it yourself.
I am surprised the air filter is that restrictive! I'm also curious what cats would do to the flow.
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Old Tue, Oct-31-2017, 03:12:27 PM   #32
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Default Re: American racing headers Results

Congrats OP, and very nice job documenting the gains. Yep, it's crazy how restrictive the factory intake/filter is after you open up the exhaust side a little bit...some folks still think the factory system is the best-lol

EDIT: Nice garage floor too btw!

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Originally Posted by paulclaude View Post
Nice results!

Peak torque also shifted to 6000rpm area. Would be very useful on a track car!
Ya, same on mine as well Paul.
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Old Tue, Oct-31-2017, 03:28:59 PM   #33
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Default Re: American racing headers Results

Thanks everyone
Quote:
Originally Posted by stash1 View Post
Congrats OP, and very nice job documenting the gains. Yep, it's crazy how restrictive the factory intake/filter is after you open up the exhaust side a little bit...some folks still think the factory system is the best-lol

EDIT: Nice garage floor too btw!



Ya, same on mine as well Paul.
Cant wait to see your dynos stash. Should be really interesting. Very happy with the area under the curve I gained at high rpm. The intake stuff is crazy for sure. Would be cool to see all the intakes and airboxes compared on a dyno back to back.
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Originally Posted by E36Sport View Post
Have a sound clip? Curious to see how these sound with a more civilized exhaust like the Dinan.
Very exotic below 4.5k Rpm like no other exhaust. Ill post up a sound clip when I get home. Above 4.5k they sound like a regular header though.
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Originally Posted by T3AMFiSh View Post
so did you have a stock section 2?
Yep stock section 2

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Originally Posted by SliM3 View Post
Excellent work dialing her in G!

I really think you'll make some incredible gains with cams, valves, and even throw in a valve seat regrind (good for new valves anyway). With the [flow] mods you have now, including airbox, you'll really exploit the gains cams and valves can make on this engine.
Thanks again, you're the best. Maybe after I get all the other stuff on. Would be crazy for sure.

Last edited by 95bullet; Tue, Oct-31-2017 at 03:39:55 PM.
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Old Tue, Oct-31-2017, 08:15:46 PM   #34
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Default Re: American racing headers Results

Nice to see some data on these.
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Old Tue, Oct-31-2017, 08:42:04 PM   #35
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Default Re: American racing headers Results

Thanks for sharing OP! I will echo everyone else, nice to see some cold hard independent data on these. I am most impressed that you tuned your car yourself. That should help ease some of the tuning fears that this header seems to have going with it.
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Old Tue, Oct-31-2017, 10:13:29 PM   #36
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Default Re: American racing headers Results

Ok so stock intake is not good? Iíve always read on here that stock isnít restrictive at all.

I have the dry afe filter, hope that helps some. Nice gains btw op!
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Old Tue, Oct-31-2017, 10:24:37 PM   #37
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Default Re: American racing headers Results

Quote:
Originally Posted by Paulo M View Post
Ok so stock intake is not good? Iíve always read on here that stock isnít restrictive at all.

I have the dry afe filter, hope that helps some. Nice gains btw op!
stock intake is probably good for the stock headers.it's obviously not when opening up the exhaust like these headers do.
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Old Tue, Oct-31-2017, 11:20:56 PM   #38
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Default Re: American racing headers Results

How about that!! Nice gains OP!!

Now, I am kicking myself for not taking the first set when they were offered.
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Old Wed, Nov-01-2017, 12:13:36 AM   #39
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Default Re: American racing headers Results

Quote:
Originally Posted by Paulo M View Post
Ok so stock intake is not good? Iíve always read on here that stock isnít restrictive at all.

I have the dry afe filter, hope that helps some. Nice gains btw op!
Yeah, the intake filter results are odd. The stock intake is pretty free flowing, and the filter isn't the limiting factor of it.
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Old Wed, Nov-01-2017, 12:22:14 AM   #40
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Default Re: American racing headers Results

Wow impressive numbers.
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Discussing American racing headers Results 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)