straight pipe in the center or straight pipe in the rear? - Alfa Romeo Bulletin Board & Forums
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post #1 of 28 (permalink) Old 07-24-2019, 07:30 PM Thread Starter
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straight pipe in the center or straight pipe in the rear?

straight pipe in the center or straight pipe in the rear?

Which option should be louder?

Option A:
Straight pipe in center
Rear Ansa Sport exhaust

Option B:
Center muffler
Rear straight pipe (Centerline Stinger)

Thanks

1992 Alfa Romeo Spider Veloce, 2017 Alfa Romeo Giulia, 2018 Volkswagen Tiguan SEL Premium
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post #2 of 28 (permalink) Old 07-24-2019, 07:35 PM
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Curious as well.

I'm wondering about this as well. I'd like my S3 to have a little more sound, but nothing stupid loud or annoying when cruising at 60mph

1981 GTV6 3.0L
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post #3 of 28 (permalink) Old 07-24-2019, 07:42 PM
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I have a center muffler and a centerline stinger. It’s louder when you get on it, and just a nice sound at idle. Easy on the ears and no yelling with your passenger. On the highway it’s also a nice, easy sound.
Minimal cost.
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post #4 of 28 (permalink) Old 07-24-2019, 07:50 PM Thread Starter
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I currently have option A but I am considering doing option B.

Option A does sound good, but I wouldn't mind it being a little louder.

Thanks

1992 Alfa Romeo Spider Veloce, 2017 Alfa Romeo Giulia, 2018 Volkswagen Tiguan SEL Premium
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post #5 of 28 (permalink) Old 07-24-2019, 07:55 PM
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Depends upon what kind of center muffler/rear muffler you have. When I had OEM mufflers on my Spider the rear one did most of the work. With no cat I tried a stinger and just the middle box and it was very loud. I currently have a Borla straight thru in the center and a small straight thru glass pack in the rear and it is not too loud if I am light on the gas.

I think that the original middle box has little in it. When you design a straight pipe exhaust the distance to the end of the pipe is important but a large box looks like the end of the pipe and the waves don't "see" anything that comes after it. So the middle box is most likely to tune the exhaust length and it offers minimal restriction and the engine does not "see" the more restrictive box that comes after it.

If you want it a bit louder without upsetting the tuning of the exhaust then I would keep the middle box and replace the rear with something that is less efficient at muffling than the stock one.
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Last edited by alfaparticle; 07-24-2019 at 08:08 PM.
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post #6 of 28 (permalink) Old 07-24-2019, 10:00 PM
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I have headers, no cat, a mid muffler (oem) and rear stinger. Sounds awesome. Would be too loud without mid muffler in my opinion.

''Aerodynamics is for people who can't build engines"- Enzo Ferrari
"Back in my day, tires were skinny and the drivers were fat"- Fangio
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post #7 of 28 (permalink) Old 07-25-2019, 01:20 AM
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My S2 has stock front and mid, with a modified stinger in the back. I welded the last foot of the original muffler to the stinger to get the fumes to the floor and away from the car, as I noticed I got a headache pretty soon everytime I drove the car with the straight stinger. The factory put it there for a reason.

Lovely rumble now, but not annoyingly loud on long roadtrips..

JC de Koeijer

Giulia street rod, '65 Giulia 1600Ti, 74 Spider Veloce, '05 GT.
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post #8 of 28 (permalink) Old 07-25-2019, 02:09 AM
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Slightly off topic: on Mustangs and many other cars when running straight pipes, drivers complain of "drone" setting in at cruising speeds, 2,000 RPM or so. I've not heard such complaints from Alfisti and I'm wondering if that is because we are cruising at higher RPM. The cure to drone is Hemholtz chambers or J pipes, which when included in stock mufflers are usually believed to be "power robbing" but when added to straight pipes become "cool". I suspect this is what is being discussed in post #5 re tuning. My understanding is broad brush, so I am asking a genuine question. The Mustang, Porsche, Miata, Nissan Subaru boards have lengthy discussions but I've not seen any on here.
If you are looking for louder, by all means look at the intake side, which will release glorious amounts.
Sadly, I just added some stick on sound deadner to my air box and surrounding area in an attempt to preserve some of the hearing lost to loud pipes over the past half century. I've seen a tech bulletin regarding the need for a turn down on the S2 Kamm backs rear pipe to avoid exhaust fumes in the cockpit, apparently the aerodynamics on the S1, 3, 4 are different and not so sensitive.
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post #9 of 28 (permalink) Old 07-25-2019, 03:52 AM
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On the 1600 with cast Iron exhaust, stock center muffler, and stinger nice tone, not obnoxious .
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post #10 of 28 (permalink) Old 07-25-2019, 04:30 AM
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Quote:
Originally Posted by Tom Frasca View Post
On the 1600 with cast Iron exhaust, stock center muffler, and stinger nice tone, not obnoxious .
Same setup as Tom, but on a 2-liter '79 Spider: just right, no annoying drone at cruising speed.
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post #11 of 28 (permalink) Old 07-25-2019, 04:46 AM
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My bone stock 86 Spider has the 2pc exhaust manifolds and downpipes with the front muffler from an S2 car (no CAT, but with an O2 bung welded in), an S2 center muffler, and a rear muffler delete stinger pipe. Only a bit louder at idle and small throttle openings and no drone at highway cruising. Glorious deep tone at WOT. Best sounding S3 Spider ever, so I have been told by people following me.

ALFA ANDY
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post #12 of 28 (permalink) Old 07-25-2019, 08:45 AM
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I'm aligned with Tom & Mario with my Duetto.
Stock header and down pipe, mid muffler and the stinger.
No droning at cruising speed either.
Plus the stinger is easy to just pop on and see how it sounds in your garage.
That eliminates having to go to a muffler shop and have welding and any modifications done.

'67 Duetto, '74 GTV
Past '78 Alfetta w/ TwinSpark
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post #13 of 28 (permalink) Old 07-25-2019, 10:20 AM
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Quote:
Originally Posted by 390377 View Post
The cure to drone is Hemholtz chambers or J pipes,...
This is interesting....Helmhotz resonators.....I learned a new thing today, thank you!



To add another data point, my sort-of-custom Duetto exhaust with a stinger has always produced a bit of a sooty exhaust smell on long top down drives. Good noises though.

1967 1600 Spider
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post #14 of 28 (permalink) Old 07-25-2019, 10:23 AM
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I'm a huge fan of my Centerline exhaust setup for my S3 - I've had multiple people come up to me and say its one of the nicest sounding cars they have heard.

- Centerline Header GTV/Spider (w/o catalytic converter) - PH115 https://www.centerlinealfa.com/catal...spider-1971-78
- Centerline Stinger Exhaust (highly recommend) - OE591 https://www.centerlinealfa.com/catal...stinger-spider

& Centerline's midsection
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- Sporting
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post #15 of 28 (permalink) Old 07-25-2019, 10:31 AM
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Quote:
Originally Posted by lgbalfa View Post
.... I wouldn't mind it being a little louder.
lgb - Even more louder.....

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