it's all personal preference .. shouldn't be what he said or she said.

They have advantages and disadvatages.

Dual = heavier (most likely) but quieter
single = lighter and louder...

dual = two muffler to rust out
single = one muffler to rust out

 

Singles look goofy on FC's.

 

not arguing a point but here in the big city of augusta if you have big rice mufflers then your generally louder than people with one muffler i.e. me because my friend has two 4 inch tip mufflers and they are so freaking loud you cant carry on a conversation in his car and i also think that because he has had his exhaust longer that the flames have burnt out alot of his fiberglass and that could be why his exhaust is louder but he and i have about the same setup except mine being single and its louder and ive heard various owners around here with big rice tips drive past and they are defenitely louder....Now on the other hand if you get a stock looking exhaust i.e. racing beat hks etc. then of course its not gonna be that loud and could give a single a run for its money on whos quieter.... just a thought im just a stupid kid with an rx7...

 

I through a muffler threw your window.

 

when i was stationed in colorado, i saw an fc out there with a muffler on one side. i always thought that half of the exhaust just broke off or rusted through and fell off or something. everytime i walked by it in the parking lot i thought to myself,"dang that looks retarded. he needs to get that stupid lookin thing fixed!!!" i can imagine what others would think with a single on an fc. although if it weren't for that cutout in the bumper, it wouldn't be a problem and i'd go single myself. but it HAS the cutout so i'm gonna go with dual.

hey and maybe another advantage of the duals.....the weight is disbursed evenly when driving around so the car won't flip over on one side like a single would. haha!
scott

 

If your car is an N/A, that would be loud. Singles seem to be louder than duals (less mufflers). As for performance, remember that even though the exhaust goes through two mufflers with a dual system as opposed to just one muffler on a single system, it actually has less restriction if the runner pipe volumes were the same. It is like mounting two speakers in tandem versus series. Two, 4 ohm speakers in tandem actually have 2 ohms of resistance. Mount them in series (one after another like those stock pre-cats) and you would have 8 ohms! The same would be true with mufflers. Split the exhaust flow and use two mufflers beside each other to half the restriction compared to just a single muffler on one pipe.

Of course, the single exhaust systems have freer flowing (and much louder) mufflers to make up for this, which is why they are looooooouuuuuuud on non-turbo Rx-7's.

I personally have a dual HKS system after my Racing beat header and presilencer and it is still has a very satisfying, pounding sound, just without the high pitched metallic buzz that some cars get with those single mufflers that have 3" exit pipes.

Hope this helps.

 

a single 3" exhaust will support over 500hp from a turbo rotary. thats a good enough reason for me!