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      05-25-2011, 01:22 AM   #1
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1M First Exhaust mod by HP Autowerks, Inc.

Ever since we picked up the 1M we thought the exhaust was a bit too civilized. It needed a bit more rumble, nothing overly loud, but just a touch more.

We removed the oem mid-pipe(28.3 lbs) with two secondary cats and a resonator and replaced it with a full stainless steel resonated mid-pipe(21.2 lbs). The mid-pipe has dual 2.5" pipes with dual resonators, into a single 3" Y.

Installation time is about 30 minutes using hand tools with a perfect fit.

Here is a quick video with sound(we will post another one later as we were running out of daylight):

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Last edited by HP Autosport; 05-25-2011 at 01:45 AM.
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      05-25-2011, 04:22 AM   #2
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HP gain? Dyno comparison??
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      05-25-2011, 04:55 AM   #3
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Quote:
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HP gain? Dyno comparison??
Not looking for HP gain here, but simply for better sound.

10 hp and similar torque numbers shouldn't be out of the question.
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      05-25-2011, 05:23 AM   #4
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      05-25-2011, 06:53 AM   #5
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Looks simple, very clean.
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      05-25-2011, 07:12 AM   #6
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well keep up the good work and i will be sending you a list once you have more on offer...unfortunatly my 1M only arrives in August!!
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      05-25-2011, 07:41 AM   #7
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Somebody please dyno this car already!
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      05-25-2011, 10:16 AM   #8
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I agree with the dyno comment. I am even more curious what a stock 1M would dyno at. Will the results show more hp/tq similar to the 135i?

Great you guys are jumping on mods for the new 1M. Keep up the good work.
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      05-25-2011, 11:41 AM   #9
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When should be expecting these parts for sale?
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      05-25-2011, 11:45 AM   #10
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How does it sound in the car while cruising or part throttle? No drone?
When I was under my car the other day I was looking at this section of pipe and thinking similar things as you. Thanks for cutting away.
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      05-25-2011, 12:10 PM   #11
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Quote:
Originally Posted by Cisitalia View Post
I agree with the dyno comment. I am even more curious what a stock 1M would dyno at. Will the results show more hp/tq similar to the 135i?

Great you guys are jumping on mods for the new 1M. Keep up the good work.
The car will be headed to GIAC for a base run and R&D on software flash very soon.

Quote:
Originally Posted by carchrism5 View Post
When should be expecting these parts for sale?
It's available now!

Quote:
Originally Posted by Dan Parker View Post
How does it sound in the car while cruising or part throttle? No drone?
When I was under my car the other day I was looking at this section of pipe and thinking similar things as you. Thanks for cutting away.
It was mostly heavy footed driving late afternoon to enjoy the new music. I'll do a 10-15 mile normal cruise to see about drone. Not that there is any to start with, maybe just a little resonance or drone to some people.

Edit: Just did a 20 miles loop... At 60 mph the exhaust is as quiet as it was stock if not quieter. At 65 mph the story is the same. At 70 mph or about 2300 rpm there is a slight resonance. And at 75 mph is back to the nice and quiet cruise. The exhaust note is very sporty now around town and has the gurgle that I was looking for, accelerating through the gears are with some authority now.

Last edited by HP Autosport; 05-25-2011 at 01:13 PM.
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      05-26-2011, 12:56 PM   #12
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Great job, guys! So the midpipe on the 1///M is the same as on the N54 135i?

If so, that's great news as it means I can re-use my Maddad mids!
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      05-26-2011, 01:02 PM   #13
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Quote:
Originally Posted by Tuned1 View Post
Somebody please dyno this car already!
http://blogs.insideline.com/straight...s-m-coupe.html

331 hp and 362 ft.lbs at the wheels
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      05-26-2011, 01:21 PM   #14
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Quote:
Originally Posted by ///M1 View Post
Great job, guys! So the midpipe on the 1///M is the same as on the N54 135i?

If so, that's great news as it means I can re-use my Maddad mids!
Yes, it is!
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      05-26-2011, 01:23 PM   #15
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Quote:
Originally Posted by HP Autowerks View Post
Yes, it is!
Saweet! Exactly what I wanted to hear!

Thx a lot guys for already tinkering with the car and sharing your findings! Look forward to more updates.
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      05-26-2011, 10:11 PM   #16
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Looks good. Any video/sound of these midpipes installed on a 135i w/ a aftermarket muffler?
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      05-26-2011, 10:36 PM   #17
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Is this the Berk Technology mid-pipe?

Thanks.

Neil
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      05-27-2011, 04:05 AM   #18
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can we get some audio of the exhaust driving past or away from the camera please?
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      05-27-2011, 08:49 PM   #19
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Quote:
Originally Posted by Hind View Post
Looks good. Any video/sound of these midpipes installed on a 135i w/ a aftermarket muffler?


Quote:
Originally Posted by MDORPHN View Post
Is this the Berk Technology mid-pipe?

Thanks.

Neil
yes, it is.

can we get some audio of the exhaust driving past or away from the camera please?

Quote:
Originally Posted by Trutchy View Post
can we get some audio of the exhaust driving past or away from the camera please?
Yes, we will be have something in a few days.
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      06-29-2011, 12:11 AM   #20
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Quote:
Originally Posted by Trutchy View Post
can we get some audio of the exhaust driving past or away from the camera please?
Here you go!

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