should i get dual 3" out the side under the doors...or get dual 3" out the back????

 

If your stuck on having duals...go out the side. A single 4" Mufflex, will outflow a dual 3" over the axle. Besides that, it is hard to get duals over our rear axles, due to the panhard bar.

Get a Boom Tube for your exhaust tip...

 

No single 4" will outflow 3" dual. Math doesn't lie.

 

What kind of motor do you have that you think you need dual 3in exhuast ??