Steven, your car is coming along nicely.
A couple of things to keep in mind if you do build a
side exhaust like the one I built:
It will be LOUD when the engine is under a load and as there is only room for one muffler for street or track use if one is required for racing. You will need to build a baffle to insert in the end of the pipe. I am making one up for the street and for driving to and back from VSCCA race meets so I don't have to spend all the time needed to load it into trailer and get the rig all set up and ready to go.
Since your wife and kids will likely ride w/you at times, when you are stuck in traffic or moving slowly, at times exhaust fumes will come thru both the the drivers and passenger side windows.
Because of this issue systems like this are illegal for road use through out the country and you could get ticketed.
Will be building a baffle as soon as I get back from the last race of the season at Lime Rock this upcoming weekend. If it does not quiet down the side pipe enough for street use I am planning to build an easily removable under the axle rear exhaust with a resonator this fall or over the winter for use on longer trips.