ahh okay..well i was looking at my muffler and it seems the pipings are already big..i bought the car second hand so i don't know what muffler it is...its just too quiet for me and its look are not so great either..so i'm guessing its chambered..at idle it has a nice bass sound but if i accelerate it just sounds like a whooshing sound like phiiiiiishhhh hehehe haven't really heard it if someone else is driving it and me hearing it pass by..i'm guessing i'm gonna have to cut off the old pipe and weld it with a new one? hehe thanks for helping me out a total newbie! hehe