Berk Technology Dual Exit Muffler Delete - Review

[sittinSideways]

Originally Posted by Ari PD

Is this the system that maintains aerodynamics? I believe I remember you saying you had issues at the track with the original one. Without the factory muffler in place, there is a fairly large hole for air to get trapped in. It is a little overwhelming how many systems are out there, but I definitely am most concerned with one that is going to maintain the factory aerodynamics.

Is this "hole" created by the Berk muffler delete?

[Ari PD]

Originally Posted by sittinSideways

Is this "hole" created by the Berk muffler delete?

If you look at pictures under the car (or look under your own), you will see that there is a rounded cutout in the underbody where the muffler sits. If you replace this muffler with just a pipe, you are bound to have airflow that would otherwise be sent under the muffler going up into this area and potentially creating rear end lift at a high enough speed. @CSG Mike said that he noticed this when at the track using the original axel back that was just a pipe. That is why I asked him to speak to the new design.

Beyond all that, you're really not looking at serious HP gains by replacing that part of the exhaust. Honestly, one of my main reasons for replacing the factory axelback was for the look. I want larger tips to fill in the area between the rear bump and my factory diffuser.

[CSG Mike]

Originally Posted by sittinSideways

Is this "hole" created by the Berk muffler delete?

It sure is. It's not a huge deal though unless you're pushing the limits of the car, and it's enough to push the balance of the car from under to oversteer. I'd be willing to bet it applies to only a handful of cars on this board. While I noticed the difference, it wasn't enough to cause the car to get loose enough to worry me.

I spent the last weekend testing the latest Berk axleback prototype cornering at 90+ mph, at the limits of grip in the CSG BRZ

Originally Posted by Ari PD

If you look at pictures under the car (or look under your own), you will see that there is a rounded cutout in the underbody where the muffler sits. If you replace this muffler with just a pipe, you are bound to have airflow that would otherwise be sent under the muffler going up into this area and potentially creating rear end lift at a high enough speed. @CSG Mike said that he noticed this when at the track using the original axel back that was just a pipe. That is why I asked him to speak to the new design.

Beyond all that, you're really not looking at serious HP gains by replacing that part of the exhaust. Honestly, one of my main reasons for replacing the factory axelback was for the look. I want larger tips to fill in the area between the rear bump and my factory diffuser.

Exactly. I will pay for a track day out of my own pocket for ANYONE who can prove that they gained power from an axleback on apples to apples comparisons on the same dyno, same day, beyond the error range of the dyno. Just an axleback.

The Berk Muffler Delete is strictly to reduce weight, and it performs it's function 100%

[Kido1986]

Originally Posted by CSG Mike

Exactly. I will pay for a track day out of my own pocket for ANYONE who can prove that they gained power from an axleback on apples to apples comparisons on the same dyno, same day, beyond the error range of the dyno. Just an axleback.

The Berk Muffler Delete is strictly to reduce weight, and it performs it's function 100%

Deletes gain according to DSport - http://dsportmag.com/showcase/exhaus...13-asr-frsmd02

Wasn't Berk's but it's the same thing as their single.

Or am I missing your point? Not arguing, just seeing if this is what you were claiming.

[sittinSideways]

Originally Posted by Ari PD

If you look at pictures under the car (or look under your own), you will see that there is a rounded cutout in the underbody where the muffler sits. If you replace this muffler with just a pipe, you are bound to have airflow that would otherwise be sent under the muffler going up into this area and potentially creating rear end lift at a high enough speed. @CSG Mike said that he noticed this when at the track using the original axel back that was just a pipe. That is why I asked him to speak to the new design.

Beyond all that, you're really not looking at serious HP gains by replacing that part of the exhaust. Honestly, one of my main reasons for replacing the factory axelback was for the look. I want larger tips to fill in the area between the rear bump and my factory diffuser.

I see - so wouldn't a axleback rear diffuser solve this issue by covering the hole? Also, wouldn't the hole cause drag, thus negating the weight lost by the muffler delete at higher speeds?

[CSG Mike]

Originally Posted by Kido1986

Deletes gain according to DSport - http://dsportmag.com/showcase/exhaus...13-asr-frsmd02

Wasn't Berk's but it's the same thing as their single.

Or am I missing your point? Not arguing, just seeing if this is what you were claiming.

I find those results difficult to believe, especially by a publication that gets advertising dollars from the product sold.

Independent dynos?

[Kido1986]

Originally Posted by CSG Mike

I find those results difficult to believe, especially by a publication that gets advertising dollars from the product sold.

Independent dynos?

If I wasn't so damn broke, I'd dyno mine to test this for you.

[texasbound972]

I just got Berk Dual Muffler Delete installed the other day. My wife doesn't like it either, she said that she felt the floor vibrate when I started it up in the garage. But I love it! Track pipe should be ready by next Friday.Thanks again Brian!!

[sirsol66]

I ordered mine from MAP two months ago and berk keeps delaying the order...anyone got an order filled by them recently? I don't mind waiting but two months is kind of rediculous (not maps fault at all)

[Brentkaty725]

^Just ordered mine thursday from CSG, Hope I don't have the same issue with Berk.

[sirsol66]

Anybody know off hand what size the Allen key stays are? I've tried both metric and standard, but can't find the right size :-/

[sosick]

sick I want to go with this but I just dnt see spending 300 for that thing. im going turbo and I dnt want to waste money on exhaust parts just yet. let me know when u sell lol

[Brentkaty725]

Got my Berk Dual track pipe the other day and it sounds awesome. Took my 4 and 6 yr old for a ride and both did NOT think it was loud at all, even the wife approves. Thanks to Berk and CSG for the fast delivery and great service!

[sosick]

Originally Posted by Brentkaty725

Got my Berk Dual track pipe the other day and it sounds awesome. Took my 4 and 6 yr old for a ride and both did NOT think it was loud at all, even the wife approves. Thanks to Berk and CSG for the fast delivery and great service!

How much did u pay for it?