you got a grand laying around for rusty pipes?
its either MAC 4 into1 for $300 or NOS 4 into 4's/MIVV's for $1000+, if you can find them
might as well cut the slash-cuts off, reuse your headers, and fit new 2into1 pea-shooters
ebay and niche cycles have some 2into1 slip ons for the 350f headers. look like Jardines.
DSS has the $$$$repros....
Marving's got a nice yosh replica 4 into 1...
Benji's got his custom upswept 4 into 4's for big bucks, too....