Side Muffler By Pass Install [PICS]
#16
I just did the side muffler (Fabspeed) install also. Took me about 7 hours also with the rear tires hanging down while rear of car on jacks.
The sound is louder but I don't feel any drone. It's loudest from mid 2K RPM to 3K RPM, after that the system quiets down and makes cruising and carrying on a quiet conversation a non issue. Again no drone at any speed.
I don't have any sound clips just on the exhaust but someone taped this using my phone earlier today. Car had only 400 miles so I short shifted. Once I get to 1000 miles, I'll be able to track this car properly and open him up and hear him (this one is not a her) sing.
Forgot to mention, once the side mufflers are replaces, they leave behind a gaping hole behind the rear tire on each side of the car and I bet lots of mud and crap will get thrown back into the engine bay and may even corrode whatever is back there. Does anyone make some kind of a close out panel to cover the openings?
The sound is louder but I don't feel any drone. It's loudest from mid 2K RPM to 3K RPM, after that the system quiets down and makes cruising and carrying on a quiet conversation a non issue. Again no drone at any speed.
I don't have any sound clips just on the exhaust but someone taped this using my phone earlier today. Car had only 400 miles so I short shifted. Once I get to 1000 miles, I'll be able to track this car properly and open him up and hear him (this one is not a her) sing.
Forgot to mention, once the side mufflers are replaces, they leave behind a gaping hole behind the rear tire on each side of the car and I bet lots of mud and crap will get thrown back into the engine bay and may even corrode whatever is back there. Does anyone make some kind of a close out panel to cover the openings?
Yes, but did you only do Side deletes, and retained the OEM centre?
#17
That's a great looking system but, you are correct in stating that side bypass + center bypass is loud. I cobbled together a similar system using a FVD side bypass and GRP center bypass. I had the center bypass on first (valves disconnected) and really liked the sound but wanted it 10% louder. Added the side bypass and it became 40% louder (seemed too loud to sneak out of my neighborhood or go through any drive-thru) and I also got some sort of vibration/buzz around 2K RPM that was very annoying. So I have moved to side bypass + factory center muffler and it's about the same as factory side mufflers + GRP center bypass. After just a few weeks, I am longing for that increased sound again so maybe I will try to chase down the vibration/buzz........
Keep us posted as to what you end up running. (It is fun trying variations though and once you put on/take off a few times, the process becomes quick and easy)
Keep us posted as to what you end up running. (It is fun trying variations though and once you put on/take off a few times, the process becomes quick and easy)
I will run this for a while, and see how i go.
It would be hard to go back to a quieter sound. The WOT i really really love this sound.
#18
Three Wheelin'
I just did the side muffler (Fabspeed) install also. Took me about 7 hours also with the rear tires hanging down while rear of car on jacks.
The sound is louder but I don't feel any drone. It's loudest from mid 2K RPM to 3K RPM, after that the system quiets down and makes cruising and carrying on a quiet conversation a non issue. Again no drone at any speed.
I don't have any sound clips just on the exhaust but someone taped this using my phone earlier today. Car had only 400 miles so I short shifted. Once I get to 1000 miles, I'll be able to track this car properly and open him up and hear him (this one is not a her) sing.
https://youtu.be/9pVkPBhGwK0
Forgot to mention, once the side mufflers are replaces, they leave behind a gaping hole behind the rear tire on each side of the car and I bet lots of mud and crap will get thrown back into the engine bay and may even corrode whatever is back there. Does anyone make some kind of a close out panel to cover the openings?
The sound is louder but I don't feel any drone. It's loudest from mid 2K RPM to 3K RPM, after that the system quiets down and makes cruising and carrying on a quiet conversation a non issue. Again no drone at any speed.
I don't have any sound clips just on the exhaust but someone taped this using my phone earlier today. Car had only 400 miles so I short shifted. Once I get to 1000 miles, I'll be able to track this car properly and open him up and hear him (this one is not a her) sing.
https://youtu.be/9pVkPBhGwK0
Forgot to mention, once the side mufflers are replaces, they leave behind a gaping hole behind the rear tire on each side of the car and I bet lots of mud and crap will get thrown back into the engine bay and may even corrode whatever is back there. Does anyone make some kind of a close out panel to cover the openings?
Car sounds great, doesn't seem to be too loud? ... it's exactly what I wanted to do, side delete and retain the stock Ti centre muffler.
From what I have read, is the stock Ti centre muffler will not last, apparently the forward facing side will buckle and break open, causing the exhaust to leak, damaging the wiring and parts surrounding that area?
Fabspeed came up with a plate that reenforces the weak area, there is YouTube video showing it.
On the fence on what do with the exhaust, want to save as much weight as possible, and definitely don't want it too loud for around town driving.
Any thoughts would be appreciated?
#19
Drifting
I've been wondering about aero. No side mufflers does leave that giant cavern behind rear wheels. And removing center exhaust also affects aero to some degree since the muffler serves as an underbody surface to complete the totally flat topography behind the diffuser. Removing both must affect aero to some degree. Something a manufacturer like Porsche has no doubt tested, but small tuner shops welding pipes together to sound cool probably don't think about all that much.
Does the benefit of weight savings and potential heat-soak reduction to the rear wheels outweigh the cons: loss of power and potential affect on aerodynamics?
Does the benefit of weight savings and potential heat-soak reduction to the rear wheels outweigh the cons: loss of power and potential affect on aerodynamics?
#20
Drifting
Sounds similar to stock, I think? Maybe a little raspier?
Compare that to a center bypass:
#21
Three Wheelin'
I've been wondering about aero. No side mufflers does leave that giant cavern behind rear wheels. And removing center exhaust also affects aero to some degree since the muffler serves as an underbody surface to complete the totally flat topography behind the diffuser. Removing both must affect aero to some degree. Something a manufacturer like Porsche has no doubt tested, but small tuner shops welding pipes together to sound cool probably don't think about all that much.
Does the benefit of weight savings and potential heat-soak reduction to the rear wheels outweigh the cons: loss of power and potential affect on aerodynamics?
Does the benefit of weight savings and potential heat-soak reduction to the rear wheels outweigh the cons: loss of power and potential affect on aerodynamics?
Wonder what the Manthey GT2 RS has done back there?
#22
I've been wondering about aero. No side mufflers does leave that giant cavern behind rear wheels. And removing center exhaust also affects aero to some degree since the muffler serves as an underbody surface to complete the totally flat topography behind the diffuser. Removing both must affect aero to some degree. Something a manufacturer like Porsche has no doubt tested, but small tuner shops welding pipes together to sound cool probably don't think about all that much.
Does the benefit of weight savings and potential heat-soak reduction to the rear wheels outweigh the cons: loss of power and potential affect on aerodynamics?
Does the benefit of weight savings and potential heat-soak reduction to the rear wheels outweigh the cons: loss of power and potential affect on aerodynamics?
I think this is more of a problem with the side mufflers removed.
They weight ALOT. And there really is a massive massive cavern where they were.
#23
Drifting
You raise a very interesting point.
I think this is more of a problem with the side mufflers removed.
They weight ALOT. And there really is a massive massive cavern where they were.
I think this is more of a problem with the side mufflers removed.
They weight ALOT. And there really is a massive massive cavern where they were.
It's fun to mess around and "improve" your car with mods. But you can spend thousands of dollars and in the end you've made your car slower.
I remember a funny Top Gear episode where they compared a stock car with one some guy modified with new suspension coilovers/springs, sway bars, exhaust, intake, etc
Guess what... the stock car was faster around the track lol.
The other point is if someone is faster around a track in the car, stock, compared to yours with mods, then what good are the mods? Other than to make the car sound cool.
#24
I wanted to use the factory Ti center muffler so only did the side delete. Someone needs to fabricate a close out panel to fill the gaping hole so dirt and debris won't get thrown into the engine bay and maybe at the same time, do something to improve airflow into the area.
#25
I wanted to use the factory Ti center muffler so only did the side delete. Someone needs to fabricate a close out panel to fill the gaping hole so dirt and debris won't get thrown into the engine bay and maybe at the same time, do something to improve airflow into the area.
I wish i was that handy to fab something. Or at least have the tools to do such
#26
Below are some drive by videos.
BOTH videos are with Valves Closed
Both videos are taking near to redline, but not mashing the peddle. Still rolling on the throttle.
This thing is VERY LOUD. We all know videos / audio doesnt do justice. Have to hear in real life. I will get some more rolling videos soon. Its quite loud in the cabin too.
But the sound now, is like a real exotic supercar sound. Can be heard from a LONG way away.
BOTH videos are with Valves Closed
Both videos are taking near to redline, but not mashing the peddle. Still rolling on the throttle.
This thing is VERY LOUD. We all know videos / audio doesnt do justice. Have to hear in real life. I will get some more rolling videos soon. Its quite loud in the cabin too.
But the sound now, is like a real exotic supercar sound. Can be heard from a LONG way away.
#27
Burning Brakes
Below are some drive by videos.
BOTH videos are with Valves Closed
Both videos are taking near to redline, but not mashing the peddle. Still rolling on the throttle.
This thing is VERY LOUD. We all know videos / audio doesnt do justice. Have to hear in real life. I will get some more rolling videos soon. Its quite loud in the cabin too.
But the sound now, is like a real exotic supercar sound. Can be heard from a LONG way away.
https://youtu.be/-xi7ICjt6-U
https://youtu.be/U-07QCn5srU
BOTH videos are with Valves Closed
Both videos are taking near to redline, but not mashing the peddle. Still rolling on the throttle.
This thing is VERY LOUD. We all know videos / audio doesnt do justice. Have to hear in real life. I will get some more rolling videos soon. Its quite loud in the cabin too.
But the sound now, is like a real exotic supercar sound. Can be heard from a LONG way away.
https://youtu.be/-xi7ICjt6-U
https://youtu.be/U-07QCn5srU
Sounds amazing!!
#28
Now having the Febspeed side bypass w/ valves on the car for 2 weeks and a few hundred miles, I find the exhaust sound level is completely acceptable at cruising, especially once the engine goes over 3K RPM which is 73 MPH in 7th. So cruising is not an issue at all, but I do find car a little too loud for my taste in street driving, even in part throttle. The car sounds fantastic at full throttle and that wail...... So I don't want to go back to stock now and am contemplating putting some sound deadening mats in the back of the car to compensate. So the mats may add 5 pounds, but still a small price to pay for the sound and the overall weight savings.
BTW I read somewhere here that the Ti Center Muffler on the 991.2 RS is heavier than those on the .1 cars, can someone confirm this? I wonder if Porsche beefed up the sidewalls. I love the sound of the Ti muffler so I'd like to keep it as much as possible.
Now on my Touring, if I were to do anything, I'd probably just go for a Center Bypass with some kind of crossover design.
BTW I read somewhere here that the Ti Center Muffler on the 991.2 RS is heavier than those on the .1 cars, can someone confirm this? I wonder if Porsche beefed up the sidewalls. I love the sound of the Ti muffler so I'd like to keep it as much as possible.
Now on my Touring, if I were to do anything, I'd probably just go for a Center Bypass with some kind of crossover design.
#29
Rennlist Member
I just completed my side delete install last Monday and after ~1000 miles at the Smokies event, can say they are an improvement. My butt dyno can't tell any real difference, my ear dyno "feels" like its faster, and my tires appreciated removing the heat sink for the high speeds at Road Atlanta. Even in the afternoon, it didn't seem that the rears got as greasy as previous - but can't say definitively until I try it on a track I have previously been on. It took me ~3.5 hours total in my garage to do the swap. I love the new sounds. I would say it is 25% louder with just the side deletes and nothing else. I feel like 80-90% of the drone is gone.
#30
I have an appointment with Fabspeed on Monday I currently have a sw center bypass sounds incredible but I want a little louder hopefully removing the side mufflers coupled with the center delete wool sound great! Sw center is smaller then competing companies so hopefully that will keep it from being to loud and retain the high pitch!