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Exhaust Change ?

Do you guy`s think a duel out B&B would sound and perform better then my single out Borla????
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Tim

87 930: G-50 5 Speed, Powerhaus Headers, K-27, Garretson Intercooler, Monty exhaust and 1 bar boost....
Old 07-14-2010, 07:00 PM
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Have you considered a Rarlyl8 set up.They sound great and you may pick up a few HP since the mufflers have no restriction.
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Old 07-14-2010, 07:34 PM
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I've got a dual outlet B&B on my car I was planning to sell. Let me know if you're interested.


Last edited by fletcher0780; 07-14-2010 at 08:32 PM..
Old 07-14-2010, 08:27 PM
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I know of no performance gains going to a dual out muffler. Sound? Not really sure, but the dual-outs have been criticized repeatedly for resonance induced drone around 3000RPM.
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Dave
'85 930 Factory Special Wishes Flachbau
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Old 07-15-2010, 06:00 AM
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B&B dose not have a great reputation for mufflers. Borla has a great reputation for mufflers.

Don't know about the sound.

I would not expect a one in split tail pipe 'turbo' muffler that chopes up the exhaust to create the resonance that a two in two out normally asperated muffler might, but I could be wrong.
Old 07-15-2010, 07:13 AM
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I think mine sound and peform better.

I can't speak for the competition but on a straight through design such as mine the tailpipe configuration makes no significant difference. Single, dual, both the same sound level and performance. No resonance.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 07-15-2010, 09:25 AM
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Quote:
Originally Posted by WERK I View Post
I know of no performance gains going to a dual out muffler. Sound? Not really sure, but the dual-outs have been criticized repeatedly for resonance induced drone around 3000RPM.
Dave

Nice garage... Room for 5 more photos

J.J.
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Old 07-15-2010, 09:55 AM
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Ok thanks guy`s I think I am going to wait and buy Brian`s setup. Brian would you recomend the duel out or single???
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87 930: G-50 5 Speed, Powerhaus Headers, K-27, Garretson Intercooler, Monty exhaust and 1 bar boost....
Old 07-15-2010, 11:41 AM
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two words , zork tube !


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Old 07-15-2010, 12:13 PM
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Do you Zorkers drive with earplugs on? I get tired/sore ears with BB dual out after 2 hours?
Old 07-15-2010, 12:18 PM
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zork tube and open waste gate , the waste gate is louder than the zork tube .
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Old 07-15-2010, 12:21 PM
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Quote:
Originally Posted by smurfbus View Post
Do you Zorkers drive with earplugs on? I get tired/sore ears with BB dual out after 2 hours?
tell me about it. my dual out B&B was so loud and droning on the highway I wanted to crawl out the window at speed.. My new dual out exhaust system is quiet and so far I love it
Old 07-15-2010, 12:21 PM
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I think mine is modified though? Read an earlier thread about it and it was some how re-arranged and I have no drone either but it still gets to my ears after a long trip. And the open WG is something I'm not very happy about, YET (no track time either because of it). It's too "I'm here watch me" type in lower gears on some spirited slow corner exits.

But on the other hand, no 930 is for someone who is not proud for what he/she rides for.
Old 07-15-2010, 12:53 PM
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For a straight through muffler the choice between single, dual, or center exit is a matter of aesthetics. The sound level is dependent upon the muffler not the tailpipe configuration. You can modify the tailpipes to quiet down or be louder but that is a different topic and still has nothing to do with orientation.
If you wish to keep the stock look then go with the single out, if you like the dual look you'll need to cut or replace your valance.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 07-15-2010, 01:21 PM
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Quote:
Originally Posted by 911st View Post
B&B dose not have a great reputation for mufflers. Borla has a great reputation for mufflers.

Don't know about the sound.

I would not expect a one in split tail pipe 'turbo' muffler that chopes up the exhaust to create the resonance that a two in two out normally asperated muffler might, but I could be wrong.
Wrong. The resonance issue has been discussed on both the Rennlist and Pelican Parts forums for over 10 years.
The problem with the B&B muffler is two-fold. One the inlet pipe is too small, choking the exhaust.....about 10BHP left on the table there.
The resonance issue on dual-out. This isn't unique to B&B, reports of FabSpeed having the problem have been reported as well. As far as I know, this is an inherent problem with all dual-outs.
The only gains in a dual-out are visual.

IMHO, the perfect exhaust both visually and performance wise would be something like Brian's/MK Exhaust muffler exiting on the right rear and the wastegate exhaust exiting in the traditional left rear. Fewer bends in the exhaust and visually balanced at the same time.......but that's just me.
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'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with X33 cams, B&B Headers, Ruf Twin-tip Muffler, Kokeln IC, Electromotive Crankfire Twin-Plugged, Tial Wastegate(1.0Bar), K27-7006 turbocharger, Euro fuel distrib, 8:41 R&P
Old 07-16-2010, 06:19 AM
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Quote:
Originally Posted by JJ 911SC View Post
Dave

Nice garage... Room for 5 more photos

J.J.
Thanks J.J., I moved to a new "garage" in a new town, I'll work on updating it......once I get the bedroom set in the house.
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'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with X33 cams, B&B Headers, Ruf Twin-tip Muffler, Kokeln IC, Electromotive Crankfire Twin-Plugged, Tial Wastegate(1.0Bar), K27-7006 turbocharger, Euro fuel distrib, 8:41 R&P
Old 07-16-2010, 06:22 AM
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Dave,

Thanks for the correction. Can you share a link to where a dual 930 muffler has a resonance issue.

I was aware that the normally asperated has such an issue but had not heard of a single turbo having such an issue.

I agree about the turbo muffler exit on the right being the best for a performance muffler.

I have a lot of respect for Borla except for possably the weight. Would not expect a significant HP bump with a switch to an alternate muffler but that is just a guess.

On the other hand I switched from a B&B style muffler to a straight through right exit muffler and picked up 30hp on the dyno on a 360whp K27/7200 turbo'd car.
Old 07-16-2010, 08:05 AM
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I have a B&B on mine and I don't mind the sound at all. Sounds mean as hell when boosting at 6K+! Only complaint I have is the fit, which I am very dissapointed in. Prior owner installed this setup, I am thinking of eventually switching to something else.

Perhaps a dual-out arrangement with just straight pipes (one exiting pass-side off the turbo, the other exiting the driver-side off the wastegate) with 4.5" oval tips on each.
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Old 07-16-2010, 08:06 AM
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I have a B&B dual out on my car and it has a noisy drone below 2800rpm. It will set off car alarms in a parking deck at idle and rattles the windows in my building at work. It doesn't bother me too much but if I spend more than about an hour in the car or if I have a passenger I wish for something else. Above 2800rpm it sounds fine and the drone goes away.

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Old 07-16-2010, 08:49 AM
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I'm running a hybrid dual outlet exhaust right now. The muffler is for a late model Camaro (single in / dual out). The car sounds great, no resonance issue and looks mean.
Old 07-16-2010, 08:49 AM
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