Muffler upgrade, any ideas?

[rrental]

Driving around with the 1986 930 for a bit, and enjoy every minute of it. Got me some fancy wheels, but something is missing.......

More sound!!! The stock muffler is a bit blah. Any suggestions on upgrades? Don't want to go race track loud, but would like a bit more out of it.

I have been reading up a bit, and it seems in combination with an upgraded cold air intake it will reduce the lag significantly.

Any ideas what's good and what not? Anybody got spares on the shelve they want to get rid of? Let me know!

[rsrfan]

Rarlyl8. I have had stock with test pipe, Monty, B&B, Borla & Fabspeed Zork. Without question, Brians exhaust is hands down the best. He's a hell of a nice guy too...

JP

[proffighter]

1+ for RarlyL8

[Miguel Antonett]

+1 for Brian.

[Benny771]

Brians is great, i also like the duel out borla....

[Tt surgeon]

u

Driving around with the 1986 930 for a bit, and enjoy every minute of it. Got me some fancy wheels, but something is missing.......



More sound!!! The stock muffler is a bit blah. Any suggestions on upgrades? Don't want to go race track loud, but would like a bit more out of it.



I have been reading up a bit, and it seems in combination with an upgraded cold air intake it will reduce the lag significantly.



Any ideas what's good and what not? Anybody got spares on the shelve they want to get rid of? Let me know!

I've had borla and fabspeed.
Both sound spectacular. The dual out fs is pretty loud. I've heard Brian's and it is damn good too.

[CVJR]

I have an '87 which I bought a year ago, put a slightly used GHL (GLH?) from anoterh Pelicanhead on it and it's just right for the street, but not so loud.

[rrental]

Thanks for the feedback! Let me know if you have one for sale!

[Moriarty]

Thank you for the feed-back, I have also the same reflexion actually, any rough ideas of prices for the differents mufflers ?

[RarlyL8]

Our host carries a few brands including mine. My mufflers have 3 sound level options, street, hooligan, and outlaw. Street has a sport sound, hooligan is muscle car loud and outlaw is a straight pipe. Design is 3" straight through, no baffles or flow blockers. Material is 321 (titanium nickel stainless alloy). Weight is 10-13 pounds depending on configuration. Configurations are single out, dual out, center out, or GT3; 4 bolt or v-band.
Anybody else have options like that?
Thanks for the support, we appreciate it!

[patina]

I love my Borla single side dual out.

[quattrorunner]

Rarlyl8. I have had stock with test pipe, Monty, B&B, Borla & Fabspeed Zork. Without question, Brians exhaust is hands down the best. He's a hell of a nice guy too...



JP

Rsrfan has his monty still and it has the almost zork outlet look and the original outlet as an option if you like that. Contact him, nice guy and nice price.

[rrental]

Originally Posted by RarlyL8

Our host carries a few brands including mine. My mufflers have 3 sound level options, street, hooligan, and outlaw. Street has a sport sound, hooligan is muscle car loud and outlaw is a straight pipe. Design is 3" straight through, no baffles or flow blockers. Material is 321 (titanium nickel stainless alloy). Weight is 10-13 pounds depending on configuration. Configurations are single out, dual out, center out, or GT3; 4 bolt or v-band.
Anybody else have options like that?
Thanks for the support, we appreciate it!

Thanks RarlyL8 have been poking around your website yesterday. Looks really good!

[rrental]

Originally Posted by pputkowski

I love my Borla single side dual out.

It's a beauty!

[wjfk32]

I have a BB Dual and I like it alot.. Nice in neutral and loud on top-end.. Having the car in gear in 1st, the exhaust sounds just right INMOP.

But-- I heard a HOOLIGAN a few months ago... I wanted to throw rocks at my exhaust.



Walt

[JFairman]

My car had 1.5" primary tube stainless steel B&B headers with heat and the single out B&B muffler on it when I bought it. The muffler has nicely made 3" inlet and exit pipes and sounded OK but it had horsepower robbing exhaust flow restrictive baffles inside and was quieter than most performance mufflers.

The best thing about the B&B muffler is the 1" thickness of stainless steel wool packing all around the oval rounded interior surface held in place by a welded in thick stainless steel perferated liner to hold it in place.
The flat left end of the muffler has the 3" in and out pipes and the flat right side can be cut open up to about an inch from the edge without disturbing the stainless steel wool packing or perferated steel liner holding it in place.

After 5 years leaving it the way it was I decided to cut all the baffles out and open up the exit hole in the left side from 2.5" to 3" where the 3" tail pipe is welded on.
To do that I had to cut a hole in the flat right side of the muffler so I could reach in there with an acetylene/oxygen torch with my arm to cut the baffles out and another hole so I could shine a flashlight in there to see what I was doing. I cut two 3" round holes in the flat right side of the muffler because I had more plans for it.

Then with all the baffles cut out I reached all the way through with an air hose, die grinder, and carbide burr to hog out the exit hole on the left side from 2.5" to 3" so it would flow better for more top end horsepower.

After doing all that I bolted on one of these summit racing electric 3" exhaust butterfly valves over the lower 3" hole I made in the right side of the muffler. Summit Racing SUM-670150-2 - Summit Racing® Electric Exhaust Cutouts - Overview - SummitRacing.com

I had to sandwich the butterfly valve in between two 1/4" thick generic 3" exhaust flanges that have 3 bolt holes in the same place as the valve to bolt it on the right side of the muffler. I bolted a piece of thick aluminum sheet metal with gasket sealer over the upper 3" hole I made in the right side of the muffler to close it off. Could have had someone weld a piece of stainless steel in to the upper hole and that would be better I but bolted one over it instead. I used gaskets with the 3" flanges and high temp red silicone gasket sealer on them to seal it all up and I used 8mm bolts inserted through the holes I drilled from the inside of the muffler and nuts on the outside.

The summit racing 3" butterfly exhaust valve can be opened or closed all the way or left any where in between and it doesn't leak when it's closed.
It has a long wire harness with a nice center off rocker switch to open or close it.
I mounted the rocker switch in the vertical rectangular molded in empty place in the dash for a switch just to the left of the ignition switch.
It fits there perfectly like it was made for it. That rectangular molded in location that is usually empty is for a switch that controlled optional adjustable beam level european Bosch H4 headlights that are extremely rare.

I installed a short 3" cast aluminum 90 degree turn down on a 3" exhaust flange that is on the outer side of the exhaust valve. It points down towards the road and back a little. You can just see about 1/2" of the end it below the rear valance so my car looks like it has a single out exhaust and with the valve closed it is now a very nice sounding relatively low back pressure single out muffler. Open the valve while driving and it becomes a much louder dual out muffler with very low backpressure.
With the valve open it drones below 4000rpms and I leave it shut around town but above 4000rpms on the open road it not as loud and sounds real nice and the turbo makes more power with the reduced backpressure at high rpms..

Anyway, I know all this sounds kinda crazy but I'm a gadget freak, it works really good, and I like it.
The B&B single out muffler only gets a little louder with the baffles removed and the interior exit hole opened up to 3" because the 1" of stainless steel packing around the inside diameter that has no negative effect on exhaust flow but absorbs some of the noise is still there. If you cut into the muffler from the side to remove the baffles you'd destroy the stainless packing and perferatred liner and you'd would have to cut it out and remove it too. I wanted to leave it there intact.

The sound is a little raspier in a nice way without the baffles but not alot louder than before and I can hear the nice turbo whistle reflecting off trees and buildings to the left of me while driving when the window is open. I leave the valve shut around town but when flooring it out on the interstate or if I ever track the car I open the valve for a little more horsepower and if you're on the track with a helmet on you can hear the motor revs better over all the wind and tire noise which is a good thing.

I can feel a little more top end power when I open the valve around 5000 rpms under boost.

[wjfk32]

Nice write up

My wrench has the BB Header and Dual exhaust set-up. I can say it was unbearable at cruising rpms. My eardrums was going to blowout... I normally can handle engine noise..etc..etc..etc.. But in the cabin it wasn't fun to be in.

Question- If u take out the baffles wouldn't u hurt performance??? Becuz it was designed that way??? There is no pipe.. I think the flow would be scattered and not regulated out of the can...(just thinking outloud)..This is the only thing that is stopping me from doing this. This isn't an easy job to do, but sounds rewarding.

I'm running 930 headers/no cat and I might loose torque by doing this...

Walt

[JFairman]

"If u take out the baffles wouldn't u hurt performance??? Becuz it was designed that way??? There is no pipe.. I think the flow would be scattered and not regulated out of the can...(just thinking outloud)..This is the only thing that is stopping me from doing this. This isn't an easy job to do, but sounds rewarding."

If it was a normally aspirated motor tuned from the factory to make more midrange torque with some muffler backpressure like most street cars are, then yes you would loose some midrange power when lowering exhaust backpressure.

A turbocharged motor changes that though. With our 7:1 compression and slow reacting CIS there isn't any midrange torque anyway and when you reduce exhaust backpresure the turbo is free to spin up alot faster and horspower is increased alot.

I havn't felt any loss of midrange power from removing the muffler baffles and opening the internal 2.5" hole to 3". It's just the opposite, midrange throttle response is improved a little and then turbo response is improved ALOT.
I'm sure there is some weird turbulance and bouncing around of pressure and sound waves inside the gutted B&B can but it's making alot more power than before and I really like the sound while the exhaust valve is closed around town and open when occasionally going full boost out on the highway.

If I had the B&B dual out muffler like you have maybe I'd cut the right side exhaust pipe off and have a 3" flange welded on for one of these 3" exhaust valves and then make it so I could put the origonal right side exhaust pipe back on it. That way you could press the rocker switch and open or close the right side exhaust oulet or have it part way open to adjust the sound level and backpressure where you want it.
I don't know how the baffles are arranged inside the B&B dual out muffler. They have to be different so maybe you'd need a bore scope or something to look inside and see without cutting it open.

If the B&B muffler wasn't on the car when I got it I'd probably have something like Brian's straight through exhaust system with a Magnaflow 11229 Amazon.com: Magnaflow 11229 Satin Stainless Steel 3" Oval Muffler: Automotive muffler on it exitting on the right side of the car.

Pics of the rocker switch in the dash, origonal B&B left side outlet, my right side turn down outlet and exhaust valve which I made up as I went along so it's a prototype and doesn't look good but you don't see it unless you get down on the ground and look up at it. The 3" cast aluminum elbow I'm using as an exhaust turn down came off an old Jaguar inline six with L-jetronic injection in a junk yard. The air flow meter was attached to it. Lots of online places have similar ones too.

[wjfk32]

Thanks for the explanation.... Now u got me thinking and tinkering

GOOD PICS.

[Tt surgeon]

Cool
I'm working on a similar solution to my dual out fabspeed. Not nearly as fancy though!