I just installed a set of muffler bypass pipes in my 997S. Saving about 50 pounds on the weigth of the car along with getting extra horses and louder sound seemed like a good idea, untill I have the muffler bypasses installed. The sound is WAY too loud with the windows down. It is definately not for everyday driving in my opinion. The question is did any one ever try to use just one standard muffler along with a muffler bypass? I am thinking of trying to install one muffler back to see if the sound is toned down a bit.

Thanks for your input.

 

Loud is good! Loud is right! Loud works!

 

Using one muffler would add weight unevenly. And besides, you would be a little like Donald Duck. You may be wearing a shirt, but you are still haven't got any pants on.

 

I USUALLY sit on the drivers seat (the one on the left) of the car when driving it, so adding a 20 pound muffler to the right side shouldnt really make crucial difference to the handling of the car.

I dont really see correlation between half-naked donald duck and exhaust sound note of the 997 either, but hey... little do I know.

Thanks anyway.

 

Sorry you didn't get the joke.

The point was that you would be muffling only 3 out of six cylinders, really just one side of the engine. The other would still be unmuffled and really loud so I do not think you would gain much. I would also have to wonder if that would eventually have some other negative impact on the car having unequal back pressure.

In the end it is your car to do with what you want.

 

you have after market mufflers to? you could try putting both stock back on

 

I wouldnt put only one muffler on if I were you, doesnt sound like a good idea. I would instead put on some aftermarket mufflers. May I suggest cargraphic? I have heard these on a 997 and they sound great. Did you notice a big increase in power or did the noise make you think that. I drove a 996 gt3 with no mufflers and it was loud as hell but I could have sworn it felt slower.

 

Thanks. That is what I am actually worried about. I will speak to my mechanic about this...

 

I only have stock mufflers. I was looking for a low budget tune up with those muffler bypasses .. at least for now. Dont feel like spending too much on tuning untill the car is paid off completely.

 

It definitely feels slower at lower RPMs (1,500-2000), but feels a little faster above 2K RPMs.

 

Unfortunatly there isnt much that is "low budget" for these cars.

 

He-he. So now you know how loud real race cars sound on a track.

Direct exhaust is not for street cars. I would not remove stock mufflers, it is not worth it unless you tune your car specifically for track use only. There it will make some difference. Doing it for a street car is just 'fast and furious' stereotype that in reality just annoys people around you but does not give you much diffs unless you get your motor to the red zone at each gear change.

 

completely disagree. While a muffler adds some backpressure which gives you some low rpm torque benefit, it's purpose is to change the noise. I would bet the catalytic converters provide more backpressure then the mufflers do (which is likely why you see bigger HP dyno gains from high flow cats then you do aftermarket mufflers of bypass pipes).

And while you are right, a no-muffler car is loud, who cares? If the owner wants a loud car that doesn't classify them as a "fast and furious" stereotype. Would you say all the VTwin harley riders are fast and furious as they run straight pipes and are louder then all hell?

Mufflers don't make for a better "street" tune, or a worse "track" tune. They are for noise. Aside from an H or X union at a certain distance in the joined exhaust to help scavenging, the best exhaust from any performance standpoint is the less exhaust. Less bends, less restrictions, less everything. Header design aside since equal-length lengths vary based on focused RPM working range, the best exhaust is no exhaust. Be that for any application where you are concerned with performance over noise.

 

Yes it does.

Sorry, but to torture your 911 in the way how teenagers do it to their Civics is a little bit odd. Not if it cannot be done, by all means, but why for - it escapes me. you are already king of the road, making you also the loudest one on it will not change that previous fact that much.

Purpose of direct exhaust is to provide unobstructed flow on high RPMs. To throw out mufflers just for car to 'sound' differently is quite a silly thing, IMHO. Pretty much same as planting 18" subwoofers and driving around town making glass in store windows to shake.

Redesign of exhaust system is a bit more complicated than just a muffler removal - if it has to be done to a track dedicated car then it has to be done properly and will require subsequent engine tuning, ECU re flash, and much many more little things across the way. Then, yes, if done right you can get some additional power to your car without giving it too much harm.

 

Just a pet peeve, but I DO think that ALL Harley riders that run straight pipes on the roads are thoughtless fools.