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      06-11-2021, 08:48 AM   #23
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Quote:
Originally Posted by edwinm3 View Post
oem, best downpipes, no smell
Active Autowerke, best dowpipe. No smell, better sound, no CEL
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      06-11-2021, 10:02 AM   #24
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Quote:
Originally Posted by mike@x-ph.com View Post
Quote:
Originally Posted by edwinm3 View Post
oem, best downpipes, no smell
Active Autowerke, best dowpipe. No smell, better sound, no CEL
No CEL according to who?
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      06-11-2021, 01:12 PM   #25
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Quote:
Originally Posted by rborane View Post
No CEL according to who?
The downpipe comes with a no CEL guarantee, if you get a CEL they will replace it free of cost. It uses GESI cats, same brands used with their B58 and N55 proven by hundreds of users
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      06-11-2021, 01:22 PM   #26
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Quote:
Originally Posted by mike@x-ph.com View Post
Quote:
Originally Posted by rborane View Post
No CEL according to who?
The downpipe comes with a no CEL guarantee, if you get a CEL they will replace it free of cost. It uses GESI cats, same brands used with their B58 and N55 proven by hundreds of users
First time I am hearing about this for the S55. Is this a new active product? I'm only seeing the catless offering on their site.
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      06-11-2021, 02:04 PM   #27
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Quote:
Originally Posted by rborane View Post
First time I am hearing about this for the S55. Is this a new active product? I'm only seeing the catless offering on their site.
Its a new product, they now offer downpipes with GESI cats
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      06-12-2021, 11:00 AM   #28
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If the stock downpipes already have high flow cats, is the difference in flow with aftermarket high flow cats that significant? If there was that big of a difference, I can't imagine how a CEL isn't triggered.
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      06-13-2021, 02:19 AM   #29
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I run stage 2 on my 6-speed M4 comp with stock everything else. Works perfect. I don't want the torque peak that the stage 2 gives anyway as it only upsets the cars chassi and tires brakes loose, making me slower. Therefore i have also reduced torque 20% in all gears. It makes the car much nicer to drive, less wheelspin, kinder to the whole drivetrain and also crankhub for those who are worried about that. The car feels sportier with a more linear torque curve and it feels more naturally aspirated.

https://f80.bimmerpost.com/forums/sh....php?t=1298513
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      06-13-2021, 02:27 AM   #30
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Quote:
Originally Posted by M 4 FUN View Post
I run stage 2 on my 6-speed M4 comp with stock everything else. Works perfect. I don't want the torque peak that the stage 2 gives anyway as it only upsets the cars chassi and tires brakes loose, making me slower. Therefore i have also reduced torque 20% in all gears. It makes the car much nicer to drive, less wheelspin, kinder to the whole drivetrain and also crankhub for those who are worried about that. The car feels sportier with a more linear torque curve and it feels more naturally aspirated.

https://f80.bimmerpost.com/forums/sh....php?t=1298513
Comparison with torque reduction:

https://f80.bimmerpost.com/forums/sh....php?t=1579736
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      06-15-2021, 08:50 AM   #31
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Quote:
Originally Posted by gpennell0812 View Post
If the stock downpipes already have high flow cats, is the difference in flow with aftermarket high flow cats that significant? If there was that big of a difference, I can't imagine how a CEL isn't triggered.
The power difference is not significant on this engine even if you go from stock to catless. The sound difference is
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      06-15-2021, 02:32 PM   #32
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Quote:
Originally Posted by mike@x-ph.com View Post
The power difference is not significant on this engine even if you go from stock to catless. The sound difference is
Most dynos show 15hp going from catted to catless without a tune though no?
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      06-15-2021, 05:25 PM   #33
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Quote:
Originally Posted by Reprosal View Post
Most dynos show 15hp going from catted to catless without a tune though no?
Per BMS and PTF , you get that much even with a tune. Notice its only 2-3% more from stage 1 to stage 2

Bm3
Stage 1 91: up to 20%HP / 22%TQ
Stage 1 93: up to 22%HP / 23%TQ
Stage 2 91: up to 23%HP / 26%TQ
Stage 2 93: up to 24%HP / 26%TQ
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      06-15-2021, 06:06 PM   #34
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N54 tuning ran some tests using 93 octane.

Fully Stock 391
Map 0 Catless 429
Map 1 Catless 460
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      06-16-2021, 04:10 AM   #35
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Quote:
Originally Posted by mike@x-ph.com View Post
Its a new product, they now offer downpipes with GESI cats
When will you have the product available on your website? Looks like AA doesn't sell it themselves unless through a vendor.
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      06-16-2021, 09:32 AM   #36
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Quote:
Originally Posted by hlm2c View Post
When will you have the product available on your website? Looks like AA doesn't sell it themselves unless through a vendor.
Im hoping within 1 week, still waiting on pictures from AA
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      07-16-2021, 05:00 PM   #37
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Resonated catless downpipes are pretty darn quiet paired up with a resonated exhaust.

I used to run fully catless downpipes with a straight pipe on my N54 and that was LOUD.

My setup now with resonated downpipes and an akra evo system sounds just a tad bit louder than a car with upgraded midpipes. It's also as quiet as stock with the valves closed.
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      07-19-2021, 03:24 AM   #38
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Quote:
Originally Posted by mike@x-ph.com View Post
Quote:
Originally Posted by edwinm3 View Post
oem, best downpipes, no smell
Active Autowerke, best dowpipe. No smell, better sound, no CEL
I hope they got better fitment
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      07-19-2021, 10:41 AM   #39
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Quote:
Originally Posted by edwinm3 View Post
I hope they got better fitment
Spot on fitment
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