It's real easy. All you need is some solder of the appropiate size/guage, pliers to make the sharper bends and a muffler (or two) from the car/truck kit.
This was my first time out doing this. This '67 Impala is being built as a replica of a car owned by my American LHS owner back in the day. The kit comes with a BIG (427) V8 and dual exhaust. His car had a 327 and a single exhaust BUT (and there's always a but, isn't there?) his single exhaust was oversize and it came that way from the factory.
He expected me to build an appropiate exhaust out of aluminum tubing that he graciously applied but the more I thought about it, the more it made sense to build one from solder even if I hadn't tried that technique before.
So. After two tries for the forward part, one try for the connector pipe and the rear pipe, this is what I got.
The kit comes with both a muffler and a resonator but I'm pretty sure the 1:1 didn't have a resonator so the model's not going to have it regardless.
I've still gotta add hangers and a tip but I'm impressed with what I accomplished in say a half hour of work.