Any system starting out with dual pipes and ending in a single muffler, is not a ture dual system. The Borla is real close - but the mufler is not a cross or x-pipe based muffler - so the two sides really become a single exhaust in the end.

Rick

 

That drone seems to be part of Borla's character. Every Bolra system out there on every vehicle has that drone

 

Damn.

 

I have the Borla on my car and the only drone I notice is around 2000 rpms. I have an 05 Roadster and even with the top down there is no drone while cruising on the highway. The only time I notice it is if I have to slow down while driving on the highway and the rpms fall to 2000rpms. If I leave it in 6th and just apply the throttle it will drone for a second. Now this is so minor it is almost not even worth mentioning! I have had cars with exhaust that drone and the 350z with a Borla exhaust is not one of them.

Now, for the complaints about the Borla coming in too many pieces and clamps I couldn't agree more. Borla could have easily made the system much easier to install. With that said, one advantage to there being so many pieces and clamps is you can adjust the exhaust to fit perfectly. Not all cars are exactly the same and being able to adjust the exhaust to fit your car perfectly is a plus. Of course an exhaust that has bolt on flanges is much easier to install and is basically idiot proof. It will only bolt up one way and it either fits right or it doesn't. With the Borla, or any slip fit exhaust for that matter, you can adjust many different pipes to give you a better fit. I had a hell of time installing my Borla but now that I've done it a few times I could do it again in 1/4th the time.

 

Are you sure about that? I remember reading a post way back that said the Borla has 2 seperate chambers inside the muffler and that they don't mix together. I know no one knew for sure because no one wanted to cut their muffler in half to check. But I remember someone posting that they talked to someone at Borla and they confirmed there are two seperate chambers inside the muffler assembly. Whether or not that is true I have no idea.

Since you have done a ton of research designing our own exhaust maybe you actually know for sure. Did you ever cut one in half or do you know for sure what the inside of the Borla TD muffler looks like?

I am not being sarcastic or trying to be rude. I am just curious if anyone knows for sure 100% how the inside of the Borla muffler is constructed.

 

BEEKER -

Yours is an MT - drone is much different and less on MT's than it is on AT cars. AT's drag harder in those RPM ranges and drone more.

And the CLAMPS...yes...all the companies make clamps to make THEIR lives easier. They can make 1 system for 350Z and G35 - and make a simple extension for the G35 for the center section. The rear of the cars all adjust out from the slip fit. It's how they cover up their mistakes - not make it easier for you to custom fit your car...trust me.

We made 2 separate systems for our exhaust. 1 for each car. We use flanges ONLY...no clamps at all and it fits perfectly. You do have adjustability with flanges as well - just not front to back adjustments.

Rick

 

Hey - no problem or rudeness thoughts here man

Here's what I did - simple test. Plugged up the right side of the exhaust at the muffler entry...exhaust from the left side exited from the right tailpipe at 1/3 the force of the exhaust exiting the left side. Did the same on the other side, got the same result.

So - real similar to a Camero muffler in my eyes. The entry make a decent u-turn in the housing, but also share space to equalize - but not very efficient and actually will combat each other as a suction is not created - as in an X or H pipe.

I never cut mine open - in fact, I still have it in my garage - like I said - I loved that exhaust the best next to the one we made.

Rick

 

ISMSOLUTIONS, I agree with you that the slip fit and clamp system Borla uses allows them to have poorer quality control and less problems with installs. I am not saying it is the correct or wrong way to make an exhaust but it does have it's advantages over traditional flange exhausts. Now your exhaust system may fit every customers car perfectly. You will have to have perfect quality control for that to happen. Even then, every car is slightly different and you could run into a problem no matter how perfectly constructed your system is. I have read many post about fit problems with the very popular and overly expensive HKS system. That doesn't mean the HKS system has poor quality control but since every car is slightly different some people are having problems with it.

I am not trying to put down or critisize your system at all. In fact if it was available before I got the Borla I would have highly considered it. I am just trying to give as many facts as possible about the Borla because that is the only system I have installed. I'm not saying the Borla is the best and everybody should buy one. I am just stating my personal experiences with it.

 

I may be the minority here but I love the drone the extended bass note. I love it

 

Oh dude - I'm there with ya!

Here's my take and input. HKS is a very well built system - for a system that is mass built in assembly line fashion, you will have quality control issues, and they do, as you have so stated. Our system, is hand built by the lead designing engineers, that's 2 people, here in California, the owners of the shop. If needed, there is a 3rd in the shop as well who is more than capable and qualified. There is the utmost in quality control here.

I'm not trying to defend, even though it does look that way - so I apologize in advance

We have also test fitted the exhaust on many cars, as I'm sure the others have as well, and we did get a great sampling and were able to make the system adjustable in the way needed to accommodate those subtle differences and needs too.

Honestly - I'm just really happy it turned out as well as it did. I really wish the Borla was more than it was cracked up to be for me....would have saved me soooo much money but it wouldn't have been as much fun!

Rick

 

I guess that concludes that. The exhaust streams must merge in the muffler.

 

Like I said - everyone likes what they like and that's why there are so many choices.

Rick

 

Yep...and now you got me wanting to cut mine up

 

You know how to weld. Cut it in half and lets see whats going on in there.

 

My experience exactly.

 

My Borla drone gives me a headache sometimes

 

It's like a trophy....

 

Cut Cut Cut!

 

My experience is that in too high of a gear, the Borla drones/is boomy. But you have too little power when that happens so you should downshift anyway.

In the lower RPM range (<2k) in the wrong gear, it booms. But man I still love it and have been super pleased.

I just drove a 1,000 mile trip (Portland, OR to Orange County, CA) and the Borla was pretty much silent on the highway. No drone, no boom. Very nice. But get stuck in too high of a gear and lookout.

 

ISM,

Have you got any sound clips you can provide of your system? I too am looking at getting the Borla ... mainly because of the price and 2 soundclips I heard on My350Z.com. What is the price range for your true dual exhaust ?