what do you mean weld the muffler?
the best deep sounding exhaust out there are
they all have same characteristic as far as Performance and sound. don't worry it won't sound ricy either. All of these exhaust will get you the best clean fit.
if you just want the muffler-canister-, go with
they both have great sound. however you need to make a custom pipe that connects the muffler to the pipe. these will cost you about 300 bucks, everything needs to be custom. which dooes "not" guarantee the sound and Performance. you can buy yourself best axle back exhaust system for under 400.-such as apexi na, greddy evo2, borla, etc.
i would definitly go with these choices