I put a bolt together Walker system on Pickup from NAPA and it works well enough. The fit was not terrible, one pipe to trim to length and I ended up customizing it with a length of flex pipe in the middle. It wasn't expensive, about $350 including the converter (my truck only has one and the whole system is much more simple, so I doubt it's comparable). Just slightly louder than stock.
That said, I'd hit a shop and have one bent up, although maybe check prices on catalytic converters and get one yourself. Amazon has them pretty cheap, for example.
'91 Pickup - Imelda
'08 Tacoma TRD - Donna
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
"To live is to suffer, to survive is to find some meaning in the suffering." -- Friedrich Nietzsche