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      01-05-2012, 12:39 PM   #1
HP Autosport
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Borla Prototype Axle Back Exhaust with Mad Dad Midpipe Dyno Results

The green and blue lines represents the 1M with stock mid-pipe and muffler. Black and red with Mad Dad mip-pipe and Borla prototype muffler. Max gain is about 15 hp and 15+ ft/lb. We can see most of the gains are in the mid to higher rpm range so we know the stock system is not bad in lower rpm with lower exhaust flow, but can be a bottleneck once the flow demand goes up.

Current mods are GIAC Stage 1, AFE Stage 2 closed intake and ER CP. ETC FMIC is next...We will then report back on the gains.

Link to video/sound clip here:

http://www.1addicts.com/forums/showthread.php?t=627278
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Last edited by HP Autosport; 01-08-2012 at 03:37 PM.
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      01-05-2012, 01:01 PM   #2
MDORPHN
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Good stuff.

Any sense about whether the mid-pipe or the muffler accounted for the lion's share of the gains?

Neil
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      01-05-2012, 01:20 PM   #3
HP Autosport
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Originally Posted by MDORPHN View Post
Good stuff.

Any sense about whether the mid-pipe or the muffler accounted for the lion's share of the gains?

Neil
By looking at the entire exhaust system it is easy to say that the most restrictive part of the system is the N54 style mid-pies with 2 cats and extra bends.
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      01-06-2012, 11:21 AM   #4
BrianB496
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Garage List
2011 BMW 1M  [0.00]
Any word on price and when it will be available?
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      01-07-2012, 03:39 AM   #5
Alexey
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DP stock?
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      01-07-2012, 01:01 PM   #6
HP Autosport
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Any word on price and when it will be available?
No information yet from Borla.

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DP stock?
Yes, as the list of power adder mods listed in post #1.
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      01-07-2012, 01:31 PM   #7
Mnime
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In your opinion which sounds the best in person: Borla or Eisenmann?
I assume you have heard both in person?
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      01-08-2012, 09:57 AM   #8
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What's the weight reduction on this axle back compared to stock? Its the first exhaust I've seen on here that looks like it has a good shot at decent weight reduction as well as improvments to sound and flow rate.

Also, can you take a better shot from the underside? Having a hard time understanding the flow path from the one angled pic.

Thanks!
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      01-08-2012, 04:02 PM   #9
HP Autosport
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Quote:
Originally Posted by robertm View Post
What's the weight reduction on this axle back compared to stock? Its the first exhaust I've seen on here that looks like it has a good shot at decent weight reduction as well as improvments to sound and flow rate.

Also, can you take a better shot from the underside? Having a hard time understanding the flow path from the one angled pic.

Thanks!
I think it was about the same as the stock muffler. It's hard to make it any lighter as the stock muffler is very light already. Akrapovic has a lighter slip-on system if weight is a huge concern to you.

Borla is really going after the elimination of drone, better sound and flow first.

I'll have to get a photo for you when the 1M has a chance to go back on the lift again.
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      01-11-2012, 12:55 AM   #10
HP Autosport
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Quote:
Originally Posted by robertm View Post
What's the weight reduction on this axle back compared to stock? Its the first exhaust I've seen on here that looks like it has a good shot at decent weight reduction as well as improvments to sound and flow rate.

Also, can you take a better shot from the underside? Having a hard time understanding the flow path from the one angled pic.

Thanks!
Have a look at this photo.
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      01-11-2012, 08:38 AM   #11
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Looking good! Will be interesting to hear how it sounds and how much it costs.
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      01-11-2012, 12:23 PM   #12
HP Autosport
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Quote:
Originally Posted by robertm View Post
Looking good! Will be interesting to hear how it sounds and how much it costs.
Link to video/sound clip here:

http://www.1addicts.com/forums/showthread.php?t=627278

Hear this system in person at the So Cal 1M meet this Saturday!

http://www.1addicts.com/forums/showthread.php?t=628345

Last edited by HP Autosport; 01-11-2012 at 01:34 PM.
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      02-23-2012, 06:43 PM   #13
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Borla 1M Muffler

Just released!
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      02-26-2012, 07:18 PM   #14
superchargedman
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My order is in! Thanks, Harold!
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      02-28-2012, 03:58 PM   #15
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My order is in! Thanks, Harold!
Thank you! We will get it out as soon as we can!
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