Flowmaster Muffler update, new product that will benefit us 928 owners.
11-11-2004, 05:46 PM
#31
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Originally Posted by whall
Curtis
I spoke to my exhaust shop about glasspacks. They said that the car would be "wake the dead" loud. I am looking for a low rumble until I open it up, then more of a roar. The best sound I ever had was a 65 Merc I owned way back when - had headers into sidepipes. This had a amaing rumble sound unitl I opened it up - then.....
I spoke to my exhaust shop about glasspacks. They said that the car would be "wake the dead" loud. I am looking for a low rumble until I open it up, then more of a roar. The best sound I ever had was a 65 Merc I owned way back when - had headers into sidepipes. This had a amaing rumble sound unitl I opened it up - then.....
https://rennlist.com/forums/928-forum/166132-ever-wonder-what-a-1981-us-5-speed-sounds-like-with-no-mufflers.html
11-11-2004, 05:48 PM
#32
I'll chime in here too..have had a variety of combos on both my old 87S4 AT and my 89GT as well as exposure to a few on others cars too..... My preference is the Stock manifolds into the Ott X and then into 2.5 inch pipes...Bullit (or other sound absorbing) mufflers in place of the mid resonators and then 2.5 inch pipe back. Nice tone..not harsh at all
I have run the stock manifolds into GT mid resonators and a RMB..and it is wicked loud. Worse in the S4 AT since cruise is around 2500 rpm (with 2.2. rear) and that is where it resonates loudly. With the GT (2.73 rear) it cruises around 3k and it isn't as loud but at WOT..it is wake the dead time.
Another good combo is the stock manifolds, xcrossover, into the larger resonators.(.87, early 88, and GTS have these) and out a RMB. Nice and toned down around town but opens up nicely at WOT..not too harsh.
Currently I am running the stock manifolds into the X and stock GT mids but have put the rear muffler back on. A little too quiet for my taste but keeps the neighbors happy.
My second favorite combo is believe it or not...the stock manifolds and cats stock GT mid resonators..and a RMB..just enough rumble to set off car alarms... ;-) and pleasant throughout the entire rev range...
Later,
Tom
midlman@rennlist.net
89GT
I have run the stock manifolds into GT mid resonators and a RMB..and it is wicked loud. Worse in the S4 AT since cruise is around 2500 rpm (with 2.2. rear) and that is where it resonates loudly. With the GT (2.73 rear) it cruises around 3k and it isn't as loud but at WOT..it is wake the dead time.
Another good combo is the stock manifolds, xcrossover, into the larger resonators.(.87, early 88, and GTS have these) and out a RMB. Nice and toned down around town but opens up nicely at WOT..not too harsh.
Currently I am running the stock manifolds into the X and stock GT mids but have put the rear muffler back on. A little too quiet for my taste but keeps the neighbors happy.
My second favorite combo is believe it or not...the stock manifolds and cats stock GT mid resonators..and a RMB..just enough rumble to set off car alarms... ;-) and pleasant throughout the entire rev range...
Later,
Tom
midlman@rennlist.net
89GT
11-11-2004, 06:37 PM
#33
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Stock manifolds with Ott crossover into a single 3" pipe into 1 Borla into another Borla gives the 84 Euro S motor (16 valve) a "vicious snarl" sound. VERY loud, unbearable at normal freeway speeds, but SWEET above 90 mph. Replacing the Ott crossover with S4 cats gives it the perfect sound, what I would call an "angry growl". So the Ott crossover is used when I ORR in Nevada, S4 cats stay on rest of the year.
Rich
Rich
11-11-2004, 07:09 PM
#34
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Rich,
So when the cats are on you are running a 2 into 1 setup going to a dual Borla (in series) system? On my S4, I also have a dual Borla system, although mine are setup in tandem behind the cats. I am not satisfied with my sound though. It's too subtle... I want more lawlessness.
Rob
So when the cats are on you are running a 2 into 1 setup going to a dual Borla (in series) system? On my S4, I also have a dual Borla system, although mine are setup in tandem behind the cats. I am not satisfied with my sound though. It's too subtle... I want more lawlessness.
Rob
11-11-2004, 08:00 PM
#35
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Rob, yep, that's the setup I have. The early cars are not able to run dual pipes like the later cars due to space issues between gearbox and battery box, so I ran one 3 inch pipe with Borla's in series. (I know some Euro's and the 85 US cars ran dual exhaust pipes side-by-side into 1 resonator then into 1 rear muffler). The S4 cats function as good mufflers, I'm really happy with the sound. With the Ott in place, forget about talking to your passenger 
or listening to the radio....it was a long trip to the Pony Express and back, Ann put in earplugs! 
or listening to the radio....it was a long trip to the Pony Express and back, Ann put in earplugs!
11-11-2004, 08:01 PM
#36
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11-11-2004, 08:51 PM
#37
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Originally Posted by Garth S
....... The good cat is on the bench, with a gutted one installed - it must come off for surgery as there are two 'filler' tubes inside the gutted chambers rattling around:
The question is what to do with the gutted cat. it would be easiest to cut the chambers off, replace with straight pipe - and be left with an 'H' pipe. The next option would be to cut ahead of the 'H', and fab a 'X' - more complicated, but ....
So, any experience as to how one or the other would perform - and sound? Which way to go ....
The question is what to do with the gutted cat. it would be easiest to cut the chambers off, replace with straight pipe - and be left with an 'H' pipe. The next option would be to cut ahead of the 'H', and fab a 'X' - more complicated, but ....
So, any experience as to how one or the other would perform - and sound? Which way to go ....
Today, I installed the GT resonators with a GT muffler, and the gutted cat with the loose internal tubes: A much better sound, and a reasonable weight loss - huge side by side difference as seen in the pic below: now to do the next 'cat' surgery. This is looking more like cutting out the chambers and the loose tubes inside (left by a PO 'cat-gutter') - and welding in straight stainless to leave an "H" pipe.
The overall sound in the S4 is far better - but still not as nice as the 16v with a fairly similar set up - although it is a larger, single pipe.Maybe after the surgery ... ?
11-11-2004, 09:22 PM
#38
Three Wheelin'
I can vouch for the sound of Rich's car. It is sweet. Rode in it for several hours and was able to carry on a good conversation.
My car has no resonators and all other bits stock. No bad resonance and nice burble. Not as good as Rich's but nice enough for free.
Regards,
My car has no resonators and all other bits stock. No bad resonance and nice burble. Not as good as Rich's but nice enough for free.
Regards,
11-11-2004, 09:37 PM
#39
Three Wheelin'
Warren, I didn't mean G-packs only.
X-Over, G-packs, Resonators and RMB.
Hacker P,My car has no mufflers - straight pipe's after the cat. My point was that if a person removes the cats from the mix, a set of G-packs helps take out the rasp. The cats do a good job not just acting as a slight restrictor, but as a muffler as well.
X-Over, G-packs, Resonators and RMB.
Hacker P,My car has no mufflers - straight pipe's after the cat. My point was that if a person removes the cats from the mix, a set of G-packs helps take out the rasp. The cats do a good job not just acting as a slight restrictor, but as a muffler as well.
11-12-2004, 09:56 AM
#42
Burning Brakes
I'm currently running a the Borla system (from 928 intl) with a gutted cat. If I let the car idle inthe driveway long enough my wife and neighbor tend to come outside and gripe.
Jim is correct regarding the irritating resonance from the hollow cat. On my shark this usually occurs arounr 2000rpm - exhaust note gets really screwed up. I'm thinking about installing some test pipes to fix the problem.
Jim is correct regarding the irritating resonance from the hollow cat. On my shark this usually occurs arounr 2000rpm - exhaust note gets really screwed up. I'm thinking about installing some test pipes to fix the problem.
11-15-2004, 07:01 PM
#45
In Your Face, Ace
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Originally Posted by Green Goblin
Hey Abby how did they finish off the exhaust meaning the tips. They look pretty cool pics please
Andy A
Andy A
