what do I need to make my car have dual mufflers (one on each side of the car)??
well.....besides $
thx

 

All it takes is a person willing to give up a lot of low end/back pressure! Nah unless you rig it right it will seriously hurt your accel times. It has been done to 4th gens and I don't know of a 5th gen but go too big in the piping and all you will only have top end!

 

you'll have to find a body shop to cut a second indent in your bumper on the left side. then find a good local exhaust shop. talk to them about it. have them get a good y-splitter (not a u-splitter), and then mandrel bend you some good 2.25" stainless steel piping. do this behind the cat. then buy two resonators and two mufflers of your choice. one resonator and muffler on each pipe and voila, dual exhaust (not true dual - but nobody has that, not even V8's) and you won't give up a lot of backpressure for MUCH better looks. I'd do this myself if I had money.

 

Patience - for the 2004 Maxima...