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      01-21-2016, 01:34 PM   #1
David@ActiveAutowerke
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Active Autowerke | F8X Exhaust System and Mid-Pipe Technical Overview

Active Autowerke | F8X Exhaust System and Mid-Pipe Technical Overview

Many of you are familiar with the wonderful sound of our signature exhaust system, but we decided to create a thread to cover the technical specifications of our system and provide evidence that it performs just as good as it sounds!

All of our F8X systems are hand made here at our facility in Miami, Florida. The fitment on each unit is tested prior to shipping, and with in house quality control we can ensure that each system is manufactured to our standards.






Design

100% Stainless Steel Construction
Single pipe mid section for increased exhaust velocity and aggressive sound
Noise cancelling chamber to eliminate drone
Adjustable rear tips, available in stainless or matte black
Mounts using factory hangers
Rear muffler adjusts to fit with aftermarket diffusers

We chose the single pipe mid section design for two reasons:

By mixing the exhaust flow from both banks together we're able to promote increased exhaust velocity throughout the system. We found that the 3.5" single pipe maintains maximum exhaust gas speed without causing any restriction, allowing the turbos to spool quicker while also increasing flow and top end power.

Mixing both banks together also creates a very smooth sound. The S55 has a very unusual exhaust note and the dual pipe exhaust system that comes on the M3/4 does not help improve the tone at all. By combining the flow from each turbo together we were able to create a smooth, aggressive roar that sounds exactly how an M car should!

Here is a video of our mid-pipe compared to a stock system. We use pressurized air to demonstrate the effect of our design. You can see our design helps pull exhaust through the alternate bank.




Performance

Yesterday we strapped a bone stock M4 down on our Mustang dyno for some baseline runs. We then installed our signature mid pipe and rear exhaust system and ran the car on the dyno again. Below is the dyno sheet and raw data from before and after.

These runs represent numbers from the same car, on the same dyno, on the same day. No results have been altered or modified. Below the dyno is a raw data sheet of the dyno data. Both runs were performed in 4th gear.








Data Analysis

You will notice right away that around 3000rpm there is a huge difference in torque and horsepower. The happens because the fast, free flowing exhaust allow the turbos to spool quicker.

For the rest of the run our exhaust system continues to produce more torque and horsepower up to the rev limit.

The green highlighted data in the table represents peak numbers before and after. There are two yellow highlights for torque and horsepower, the first representing the maximum gain prior to the stock car achieving target boost, and the second representing the maximum gain after both runs have achieved target boost.

Maximum gain below 3800rpm: 80 Ft-Lbs and 42rwhp.
Maximum gain above 3800rpm: 20 Ft-Lbs and 17rwhp.
Peak gain: 12 Ft-lbs and 11rwhp.

We expect that gains will be amplified when used with higher boost levels. I will update the thread tomorrow with our results from today as we test our system with and without our Active-8 piggyback.

What does this mean?

Having the turbo spool sooner makes the vehicle easier to drive and will be quite noticeable on the street. The gains in the higher RPMs will be noticeable when driving aggressively or on the track.


Last edited by David@ActiveAutowerke; 03-31-2016 at 10:42 AM.
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      01-21-2016, 01:35 PM   #2
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If anyone has any questions or concerns feel free to ask! To place an order please contact one of our authorized dealers or give us a call directly!

Update! Here is a dyno of our full system along with our Active-8 piggyback.



Also some sound clips provided by Auto Talent!




Last edited by David@ActiveAutowerke; 01-22-2016 at 06:15 PM.
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      01-21-2016, 01:36 PM   #3
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Active Autowerke is the truth!

Great products and love the analysis!

Damn, that's some good info, David!
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      01-21-2016, 01:51 PM   #4
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Great work, thanks for sharing!
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      01-21-2016, 02:58 PM   #5
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Just had mine installed! Here's a quick iphone pic of AA with matte blk ceramic coated tips! Very happy with outcome!
Attached Images
  
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      01-21-2016, 07:26 PM   #6
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Awesome thread David
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      01-22-2016, 10:31 AM   #7
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Quote:
Originally Posted by Kr3st View Post
Active Autowerke is the truth!

Great products and love the analysis!

Damn, that's some good info, David!
Quote:
Originally Posted by Alex@AUTOcouture View Post
Great work, thanks for sharing!
Quote:
Originally Posted by mike@x-ph.com View Post
Awesome thread David
Thanks guys!

Quote:
Originally Posted by Lemans 335i View Post
Just had mine installed! Here's a quick iphone pic of AA with matte blk ceramic coated tips! Very happy with outcome!
Looks great!
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      01-22-2016, 10:46 AM   #8
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Quote:
Originally Posted by Lemans 335i View Post
Just had mine installed! Here's a quick iphone pic of AA with matte blk ceramic coated tips! Very happy with outcome!
Looks Sweet!!

Can you post some better lit pics though ...

Kinda hard to see... Thanks in advance
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      01-22-2016, 11:16 AM   #9
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David - Do you guys generally trim the screw coming out of the bottom of the car above the mid-pipe during install?
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      01-22-2016, 11:36 AM   #10
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Quote:
Originally Posted by dmk08 View Post
David - Do you guys generally trim the screw coming out of the bottom of the car above the mid-pipe during install?
Good question.

On some cars we've been able to install the mid pipe with no interference. If yours is touching, you can trim/grind the portion of the stud that extends past the edge of the nut to get more clearance.
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      01-22-2016, 12:25 PM   #11
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Can you do testing on just the midpipe without the rear section?
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      01-22-2016, 01:27 PM   #12
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Quote:
Originally Posted by apexit
Can you do testing on just the midpipe without the rear section?
Second this
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      01-22-2016, 01:28 PM   #13
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Quote:
Originally Posted by apexit View Post
Can you do testing on just the midpipe without the rear section?
I will make a note to dyno the next car we get in for a mid-pipe only. As long as the customer is cool with it it shouldn't be a problem.

That said, the majority of the gains will be from the mid pipe, as the factory rear system is not extremely restrictive. Our exhaust system does offer some power gains, but also does a great job at eliminating drone while maintaining the smooth exhaust note.
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      01-22-2016, 01:28 PM   #14
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Quote:
Originally Posted by apexit View Post
Can you do testing on just the midpipe without the rear section?
Quote:
Originally Posted by MThree_driver View Post
Second this
Don't stop at just the mid pipe! Do it all!
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      01-22-2016, 02:52 PM   #15
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Thanks for sharing! Have had mine waiting for install...honestly can't wait not hearing it in person anymore so hoping to get the car out and install tomorrow.

Any thought or data on obtaining additional power gains if a tune is applied?
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      01-22-2016, 02:59 PM   #16
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Quote:
Originally Posted by iuhutch View Post
Thanks for sharing! Have had mine waiting for install...honestly can't wait not hearing it in person anymore so hoping to get the car out and install tomorrow.

Any thought or data on obtaining additional power gains if a tune is applied?
I have the full system with catless downpipes and the Active8 tune, I'm pretty sure I'm in the ~500whp range.

I'll know for sure when I go down for my before and after intake dyno.
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      01-22-2016, 03:12 PM   #17
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Quote:
Originally Posted by Kr3st View Post
Don't stop at just the mid pipe! Do it all!
I have just DPs right now and have gone HAM in the past on another car. I'm trying to be a bit smarter with my money this time around. I realized on my last part out just how much I spent on the car. The small parts all add up and it doesn't help that this car is more expensive to modify than the last car.

I'm looking at either a custom midsection with tips, the AA mid with tips, or possibly the BMS exhaust. I'm in no hurry
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      01-22-2016, 03:26 PM   #18
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Quote:
Originally Posted by apexit View Post
I have just DPs right now and have gone HAM in the past on another car. I'm trying to be a bit smarter with my money this time around. I realized on my last part out just how much I spent on the car. The small parts all add up and it doesn't help that this car is more expensive to modify than the last car.

I'm looking at either a custom midsection with tips, the AA mid with tips, or possibly the BMS exhaust. I'm in no hurry
I hear you. I understand. I had all of the parts waiting for me so that when the car came in, it would be all done at once. I'm a bit of a nut though.
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      01-22-2016, 04:33 PM   #19
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Quote:
Originally Posted by Kr3st
Quote:
Originally Posted by apexit View Post
I have just DPs right now and have gone HAM in the past on another car. I'm trying to be a bit smarter with my money this time around. I realized on my last part out just how much I spent on the car. The small parts all add up and it doesn't help that this car is more expensive to modify than the last car.

I'm looking at either a custom midsection with tips, the AA mid with tips, or possibly the BMS exhaust. I'm in no hurry
I hear you. I understand. I had all of the parts waiting for me so that when the car came in, it would be all done at once. I'm a bit of a nut though.
That was like my co-worker, ordered everything before his car came in. I went crazy on my 335, my previous m3 wasn't bad, but this car is proving to be the most expensive. So I'm waiting to see how good the Bms exhaust is (along with price) to see if it's worth picking up that full system or just the mid-pipe from AA
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      01-22-2016, 04:33 PM   #20
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Quote:
Originally Posted by iuhutch View Post
Thanks for sharing! Have had mine waiting for install...honestly can't wait not hearing it in person anymore so hoping to get the car out and install tomorrow.

Any thought or data on obtaining additional power gains if a tune is applied?
I did a couple pulls yesterday on the same car with our Active-8 flash, but the RPM reading is slightly off. The numbers will be accurate but the RPM is a couple hundred off. I can post this chart if you'd like.
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      01-22-2016, 04:34 PM   #21
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Quote:
Originally Posted by David@ActiveAutowerke View Post
I did a couple pulls yesterday on the same car with our Active-8 flash, but the RPM reading is slightly off. The numbers will be accurate but the RPM is a couple hundred off. I can post this chart if you'd like.
Please post it up!
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      01-22-2016, 05:43 PM   #22
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David. Were theses numbers with stock downpipes mated to the AA mid section and rear or were there aftermarket downpipes on the car?
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