[CactusDweller]

I want a dual midpipe setup, from the videos I've watched I like the tone of a dual midpipe over a single. I've narrowed it down to Evolution Racewerks and Active Autowerke. It's hard to pick from listening to videos, and I think I've watched every video on YouTube and I've read through every thread I can find on the subject.

AA is equal length while ER is not. They both sound pretty similar in video. AA costs about twice as much. AA has one resonator or two, ER has a non-resonated option and a resonated option with two resonators.

Is there a noticeable difference in tone/rasp/noise level between the two brands? For anyone who has heard both in person, what is different about the two?

I'm planning on keeping the OEM downpipes and axleback. I'm trying to figure out if there is a difference in tone and volume that would justify the extra $1000 for the AA midpipe.

What midpipe do you recommend?

[mike@x-ph.com]

Tough choice, if you like the stock sound and want it louder, get the Evolution racewerks

The equal length is an excellent choice if you want to change the sound to a more aggressive tone.

I don't think rasp or drone would be an issue with either one if you get the resonated versions

[CactusDweller]

It's such a tough choice. I do like the stock sound on my friend's G87. I've watched and re-watched dozens of youtube videos of both exhausts and they're near indistinguishable. I might be happy with ER and save the difference for other mods.

[tom @ eas]

Originally Posted by CactusDweller

It's such a tough choice. I do like the stock sound on my friend's G87. I've watched and re-watched dozens of youtube videos of both exhausts and they're near indistinguishable. I might be happy with ER and save the difference for other mods.

Dual midpipes will outflow single if looking for real power down the road (larger turbos, port injection, etc) and save the $1000 for supporting mods.

We always have ER midpipes in stock when ready, shoot over a PM and I'll make it happen.

[Crazyotter]

Milltek 102mm single

👆

[tom @ eas]

Originally Posted by Crazyotter

Milltek 102mm single

��

2nd that choice on the single option, we always have Milltek 102mm Single midpipes in stock also.

[mike@x-ph.com]

Originally Posted by Crazyotter

Milltek 102mm single

👆

excellent option if you are looking for a clean sound with a deep midrange tone

[Dieselmd]

Originally Posted by tom @ eas

Dual midpipes will outflow single if looking for real power down the road (larger turbos, port injection, etc) and save the $1000 for supporting mods.

We always have ER midpipes in stock when ready, shoot over a PM and I'll make it happen.

Forgive me if this has been posted elsewhere but at what power level is the single considered restrictive over the equal length? Thanks.

[Crazyotter]

Originally Posted by Dieselmd

Forgive me if this has been posted elsewhere but at what power level is the single considered restrictive over the equal length? Thanks.

I’m not sure there’s a limit but I’ve seen 600+whp running singles

[tom @ eas]

Originally Posted by Dieselmd

Forgive me if this has been posted elsewhere but at what power level is the single considered restrictive over the equal length? Thanks.

Good question. Had a long discussion some time ago with ER about this when discussing single vs dual midpipes and here's what they said:

Originally Posted by Evolution Racewerks

I know the trend is for a single mid pipe because it makes the exhaust quieter and reduces droning but it does this by reducing exhaust flow. It’s like having a permanent exhaust silencer that the Japanese cars put into their mufflers to reduce flow/noise. The factory dual mid pipes are 2.75”. You would have to run a single 4” to match the factory flow capabilities of the stock mid pipes. Running a 4” single pipe would be terrible for ground clearance especially on a lowered car. Our dual midpipes are 3” and thus, we would need to run around a 4.25” pipe to match the same flow.

Our dual resonated midpipes are really quiet and like our non-resonated midpipes do not drone. I currently have our dual resonated midpipes on our M3 for testing and I personally can’t wait to go back to the non-resonated version cause it’s so quiet. You’ll see it’s as quiet as stock at idle and normal driving. With aggressive driving it gets a little bit louder than stock but still very much like stock. Being able to keep the exhaust quiet and not drone while being able to have higher flow capabilities than stock, there really isn’t a need for us to make a single pipe version.

Certainly going EL isn't providing any help on the flow side with the additional bends involved, but it sounds slightly better than stock. People might have different opinions on what is loud vs quiet, but dual will always provide more flow.