Sorry but i had duel on my hatch once, the worst thing i ever did.
The money i wasted, the time......just not worth it.
You do lose backpressure though.

 

OK, I'm going to translate for the thread starter. He is saying that he's going to put on a MUFFLER with dual TIPS. He is not putting on dual EXHAUST.

My thoughts: If you like the way it looks and sounds then more power toya.

 

I know im a newbie so you probably don't care what i have to say, but i work at a car audio shop as well and i hear the same stuff you do. DONT DO IT. I can get anything for my car as well but i dont, i get stereo stuff, and when i need preformance i take it to the local import tuner shop. duals are worthless, you loose horsepower, and their probably going to stick it to you in labor for duals. ive been reading what some of these 3rd and up gears and most of them are hittin this stuff dead on. but i understand where your coming from ive heard it all. so just let him sponsor your stereo and do the rest yourself thats what im doing.

 

Well, the answer is very different depending on whether he's talking about a full dual exhaust (some kind of y-pipe) or a dual tip muffler. So the original poster needs to clear that up.