![]() |
Double post...
|
Just a reminder for anyone interested in doing this: do your math! :)
You want a total cross section of at least 3" sq., probably closer to 3.5" sq. Use the formula for the area of a circle: http://986forum.com/forums/uploads02...1561699335.jpg |
Quote:
|
Quote:
Drone has nothing to do with weight, nor how it's mounted. "...tuned to the original weight..." c'mon man.... how gullible are you, really? Sent from my SM-G970U using Tapatalk |
Drone is a resonance that is caused by standing waves in the exhaust pipes. The reason why a cross pipe works is that a peak from a wave in one side is cancelled out by a trough on the other side The less muffling there is in an exhaust the more prone it is to droning.
|
Quote:
However, you can have zero muffling and no drone with a properly tuned crossover. I don’t know where people like lkchris get that nonsense. I see it repeated a lot...wacky. :D |
Quote:
|
Can't you add J-pipes to cancel the drone?
|
This one caught my eye earlier today. Thinking about trying it out. |
Quote:
|
Quote:
https://i.ebayimg.com/images/g/qD4AA...~V/s-l1600.jpg |
Quote:
Time to find smaller size decent mufflers that allow room for a crosspipe with crossover in a same space where the original muffler is. |
Actually.....
.....There is validity to the weight of the muffler affecting the “Drone.”
If you read the engineering description of the build of the 986, the muffler and engine and transmission were all tuned together on a “shake table” as a unit. If you look at the way the entire power train is installed, they were engineered as a complete unit and were tuned as a complete unit. The designers wanted a center outlet exhaust for a link to the original 550 Spyder. The engineers told them it was impossible with the room they had under the car. After a lot of work, they developed that one, huge, muffler and it worked. If you take that one huge muffler off and replace it with a double can setup, it completely throws off the harmonics of the system and you get that nasty “Drone” on the highway. That’s why the FVD Brombacher “Sound Version” and the “Crios Mod” OEM mufflers, and the Porsche factory accessory muffler with the vacuum actuated bypass valves are the only mufflers that give good sound and don’t produce the head splitting “Drone” on the highway. Of those three options, today, a decade plus after the last 986 was built, the most elegant solution is the FVD muffler. Unfortunately, it’s freaking expensive. BUT, it works. It’s WORTH the money. But people buy these cars because they are cheaper than Toyota’s today and everyone wants a cheap, badass Porsche sound. Just buy the FVD muffler and be done with it. Get busy driving, or get busy wrenching and cussing. Good luck. |
I agree the FVD probably sounds the best, but it is very pricey. The mod Particlewave and I did will get you 90% of the FVD sound for almost free. I guess if you took it to a shop it would cost you at most $200.
My buddy sent his muffler to Fister to do the external mod. With shipping back and forth I think it was close to $1000. The internal mod sounds almost exactly the same as the Fister mod, but way cheaper and no extra pipes visible. |
Don't overlook the Dansk 'sausage' muffler. No drone, and considerably less expensive than the FVD. Plus it's considerably more compact and lighter.
I've had mine for a couple of years now, and I could not be more pleased (bought used, dent courtesy of the previous owner). http://986forum.com/forums/uploads02...1602811323.jpg |
I tried this. We will see ?
http://986forum.com/forums/uploads02...1619673628.jpg |
That should sound great, it's basically the Fister mod.
|
I did a similar mod to the OP except I used a 1 5/8"holesaw to cut the holes in the top of the muffler and I drilled 2 x 5/8" holes straight through the internal pipes and then welded the top back up. The PO had done the Crios mod already. I can't imagine the exhaust sounding better than it does, it has exceeded my expectations. It's absolutely perfect. All it took was a bit of time, some argon and some filler wire(I'm a professional welder/machinist). I will say that welding the muffler is not easy, it's double walled and each wall is super thin.
|
Quote:
Cheers |
All times are GMT -8. The time now is 01:40 PM. |
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website