HotLap

Sharky, I LOVED the center muffler bypass on my 997...anything for the 991 yet?

rijowysock

i wish, fabspeed made something but needs aftermarket sides to run it.

HotLap

I was looking under the 991 earlier tonight and it looks like it would be fairly easy to change out. Must be patient at this point!

rijowysock

problem is that S and Base have diff setups.... the 997.2 the center was same on all..

base has 2 inlets, 2 outlets.
S has 2 inlets, 4 outlets.

HotLap

Interesting to know...hopefully the aftermarket will address the "S" 1st

rijowysock

what they have done so far is make a dual in dual out and then put diff side mufflers on it... makes sense since product could be used on both cars..

the "S" setup with actual quad exhaust is very nice tho, was surprising for me to see on a non PSE vehicle.

HotLap

I have to admit the stock 991 S exhaust note is more aggressive than my stock 997.2 S exhaust note was. At times it seems on par with my 997 after I installed the Sharkwerks center muffler bypass pipe.

ScorpionT

The 991 does sound quite a bit better (in car) than the 997.2, even with a center muffler delete. Unfortunately outside the car the overall volume is relatively similar.

HotLap

Rookie question I know, bu tI thought I'd read something in the early 2012 new model hype that Porsche was doing something to make the sound more agressive in the cabin? Can't seem to find the refernce anymore and it's not in the build specs

Carrera GT

You're probably think of the "symposer" in the 991. It's an air duct that carries engine compartment and intake noise to the cabin. It has a switch to open and close the duct. The same gimmick is showing up on Fords and the like.

Separately, there's also the Sport Exhaust option, which adds some throaty crackle and a bark on overrun.

Both systems are a tad artificial, but not bad. Even though I have the factory Sport Exhaust on this car, I'm hoping the Sharkwerks bypass produces a "real" exhaust note.

neanicu

If Porsche's system is artificial,you haven't heard the new BMW M5. Now that's artificial! It comes through the speakers. In Porsche is real intake noise!

ScorpionT

Even eliminating the center muffler and routing the exhaust through the side mufflers still leaves the car with a rather bland sound (Ive heard it before). I think Porsche decided the exhaust could be more tame on the outside (read:boring) because the symposer sounds decent in the cabin.

rijowysock

991 base= all engine noise...
991 S= great popsand burbles..
991 with PSE= better pops and burbles..

i usually dog the "S" but i wouldnt mind having someone's left over "S" exhaust and messing around with it a little to put on my base....

Carrera GT

I'm not sure the 991 engine is the same head and header as the 997, certainly the rest of the plumbing is quite different. I'm hoping that "liberating" the exhaust gases will be rewarded with a little giddy up and some better sound track.

Carrera GT

Absolutely true. If you'd told me beforehand of rumors that BMW was going to the "through the speakers" nonsense, I would have placed a sizable bet that will never happen, but here it is and it's ludicrous.