Borla exhaust

[DarkStar]

Install Headers and Secondaries, drone problem solved!

Borla sounds OK. I've compared it to a cheap Beluga (ebay $200 50mm exhaust) and I'd rather have the Beluga. Borla looks kinda cool out the back but it's not aggressive sounding. enough.

For those confussled... You know what it's it's like when you can hear yourself talk, breath, grind your teeth, deep inside your inner ear so much that it annoys the **************** out of you? Imagine the exhaust note echoing through your cabin like that around 3500 to 4500 Rpm.

Incomplete exhaust systems (muffler only) causes the exhaust note to be surpressed in certain ways but overly annoying in others. While when you have a full flowing exhaust, the exhaust note is less inside the cabin and more out the back where it should be. Basically the same concept as bass reflex in car audio systems.

[10/10ths]

....the fact of the matter is that Porsche designed the engine, transmission, and entire exhaust system as a unit, and that entire unit was placed on a "shake table" and the harmonic balance of that entire unit was matched to the rest of the car and acted as a tuned balancing system.

That's why the muffler is attached the way it is with that big cross beam.

That is why any two muffler setup will sound horrible inside the car.

This FACT is well documented in the Porsche history book "Excellence Was Expected."

The whole dang powertrain is matched to offset the chassis harmonics and null them out.

[maytag]

Originally Posted by 10/10ths

....the fact of the matter is that Porsche designed the engine, transmission, and entire exhaust system as a unit, and that entire unit was placed on a "shake table" and the harmonic balance of that entire unit was matched to the rest of the car and acted as a tuned balancing .....

Yeah, sure it was. Haha!
Sorry pal, I don't believe it for a second. Not on a $50,000 car. No way.
It being written up in a book (a quick Google about the book suggests that the Boxster was not part of the vehicles covered, but I have not confirmed this.) doesn't make it true.

For instance:
https://goo.gl/images/G4etjK


And you throw down subjective things, like what sounds good, as if it's fact. I get it, I do the same thing! Haha
but, you have to realize, that what sounds good inside a car, is subjective. It is not something that the Porsche engineers have the final say on.



Sent from my SM-G930T using Tapatalk

[10/10ths]

....that what sounds good to one person, is noise to another.

If you like it loud, that's absolutely fine. to each his own.

My point with my posting was in response to folks who have posted a lot of questions on this forum about different mufflers and if they have a drone inside while traveling down the highway.

EVERY two piece muffler installed on a 986 will have this drone.

And the reason why, is what I described. THAT is a FACT.

Now, that doesn't mean that a Borla or a Fabspeed or some other two muffler design is not right for YOU, or for many others.

I'm just trying to educate the folks who want some more sound outta their 986, but don't want a system that drones down the highway.

So, for those who care, note the dates on the bottom right corner of the book cover.

Enjoy:

[10/10ths]

....this harmonic balancing is also why it is CRITICAL to use a dual mass flywheel like the OEM unit instead of an aftermarket single mass flywheel.

There are all kinds of weird harmonics that affect a vehicle when all these parts are spinning around as you go down the road.



By the way, I DO think the Fabspeed sounds AWESOME.

I just couldn't live with it on a real world, cross-country driving 986.

For a weekend toy? Sure! I'd slap one on.

But my car is used for cross-country vacation trips in addition to just cruising down to the local car show.

[Oldcarguy]

Originally Posted by maytag

. . .It being written up in a book (a quick Google about the book suggests that the Boxster was not part of the vehicles covered, but I have not confirmed this.) doesn't make it true. . .

. . .what sounds good inside a car, is subjective. It is not something that the Porsche engineers have the final say on. . .

Excellence Was Expected is not just “a book”. It is pretty much the most holistic, definitive book on Porsche ever written. You should give it a go sometime.

Porsche engineers, along with other Porsche decision makers, actually do have the final say on everything about the car when it leaves their assembly line. It’s their product and, right or wrong, they make it as they see fit. A buyer can change it with aftermarket parts or a baseball bat to suit their personal taste, but they cannot affect the design and production process in any fashion other than indirectly with their future purchase decisions.

I agree that what sounds good inside a car is subjective and I can subjectively say that the Borla tried to drill a hole through my head from around 2,200 to 3,000 rpm. The Brombacher, designed externally much like the original single muffler, does not and it still wails all the way to redline.