Borla exhaust?
#1
Contributors
Thread Starter
Join Date: Aug 2009
Location: Boynton Beach Florida
Posts: 86
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2007 525I Titangrau II
![Default](https://5series.net/forums/images/icons/icon1.gif)
I was curious as to why no one here is running a Borla exhaust on their E60? I have had very good experiences with them on past cars. Everyone is telling me to get an RPI but I am having a hard time pulling the trigger on a relatively new company over a very well established one such as Borla or Magnaflow. Opinions?
#2
![Default](https://5series.net/forums/images/icons/icon1.gif)
I've got borla, but it came on the car when I bought it so I can't compare it to stock. It has a nice subtle purr and isn't very overwhelming noise-wise. I don't think it has any performance enhancement...
#3
Contributors
Join Date: Oct 2008
Location: Ft. Lauderdale, FL
Posts: 946
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2004 545i, Sport and Premium package, Titanium Silver with Black Dakota Leather interior
![Default](https://5series.net/forums/images/icons/icon1.gif)
Originally Posted by heelsmj' post='1015987' date='Sep 24 2009, 02:40 PM
I was curious as to why no one here is running a Borla exhaust on their E60? I have had very good experiences with them on past cars. Everyone is telling me to get an RPI but I am having a hard time pulling the trigger on a relatively new company over a very well established one such as Borla or Magnaflow. Opinions?
![Tongue](https://5series.net/forums/images/smilies/imported/tongue.gif)
I just sold my Borla and bought a used RPI (only 3 mos. used). Didn't notice if you a have a 6 or an 8 but I have an 8. When I bought the Borla, the RPI didn't exist. Borla does not make an axle-back system for the 545, not sure about other E60 models. So I purchased a universal Borla muffler and had a custom exhaust pipe created. This was much cheaper than buying an Eisenmann or Supersprint axle-back system. There were few, if any other choices for bolt-on axle-back systems for E60 545.
That being said, I was very happy with the Borla and it was a lot of fun to drive. I noticed no loss or gain of power, but it was never dyno'd so I don't have any objective data for you.
The difference with the RPI is quite noticeable.
First, the RPI will cost twice as much as a custom Borla system.
Second, the RPI is specifically designed for the car... not a universal muffler with a pipe. As others have noticed, the exhaust pipe attached to the RPI muffler is smaller in diameter than stock pipe, then expands to 3" where it attaches to existing stock pipe. I am not a physicist but my intuition tells me that this was done to maintain some back pressure, thus increasing HP without losing too much torque. I'm just guessing here! RPI has a good reputation here and they may not be willing to divulge all their engineering secrets.
![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
Third, the sound is FANTASTIC! The Borla sounds MEAN..., the RPI sounds MEAN AND TUNED. The RPI sound is cleaner... more European, super-car sound. Borla is more raspy, American, muscle-car sound.
Fourth, there is a noticeable acceleration improvement with the RPI. Again, this a subjective assessment from the driver's seat. As I said before, with the Borla, I noticed no loss or gain. With the RPI, there is a noticeable gain.
Fifth, for $500 the Borla sounds good and is a lot of fun. Got lot's of compliments at redlights, parking lots, etc. If you are willing to pay $1000, the RPI is worth every dime and then some!
I have a shitty camera so the recordings aren't great, but here's a comparison on my car:
Borla:
RPI:
#4
Former Vendor
Join Date: Oct 2006
Location: Anaheim, CA
Posts: 19,460
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: F13 M6
![Default](https://5series.net/forums/images/icons/icon1.gif)
magnaflow is another option, but not as popular as the RPI. but yes it is cheaper, mostly we do magnaflow setups for those who want a custom quad setup, but also there has been a couple for just the dual as well. then again, there is no proven guaranteed power with magnaflow.
Thread
Thread Starter
Forum
Replies
Last Post
bestofthebest
Complete Car Sales
4
03-28-2016 02:47 PM