After market exhaust
 

Hey guys I'm new to the forum I have a 2011 mazda 3 hatchback and looking to replace my oem exhaust what can I get and where thanks.

What are your goals for the new exhaust?

When I bought the car it had a 3inch straight pipe but I had to put a muffler on it I want something with an aggressive sound

Then there really isn't much advice folks can give you; you're going to have to experiment with various configurations to get to what sounds good to you and doesn't drive you crazy with droning when going down the highway. The fact is, what sounds good to some is highly annoying to others, it is an individual thing.