i have a 90 civic ex i need some suggestions on how i can get pipes to run two mufflers out the back.

 

you would have to bring it to a muffler shop and have them weld new exhaust pipes.

 

alright thanx

 

Get a Y pipe welded to ur exhaust. I wouldn't reccomend dual exhasut on a 4 cylinder tho.

 

how much does that usally cost?

 

I would seriously recommend against dual exhaust for two reasons:
1. Dual exhaust on a 4 cylinder engine is not a good thing. As far as I know, u lose horsepower.
2. Dual exhaust??? That's ricey man.
But anyway, if u REALLY wanna do it, get a y pipe like redline said, and have a shop weld it for ya. If u supply your own pipes, then expect to pay anywhere from $30-$100 to weld those suckers. It really does depend on what kind of shop u go to, and how much they try to screw u over.