Pcraner: First you made a good choice checking this forum out. These guys know what they are talking about. They helped me get started last year. The rules for FCB for USCRA state the following re: exhaust "Exhaust system may be changed. Aftermarket exhaust systems and silencers are permitted."
http://www.race-uscra.com/formulacb.html
Sorry, but I am bored at work right now given it is the day before Thanksgiving and everyone else is gone, so I am going to ramble on here abit.
If you see something else for FCB (Stock CB350 class) let me know, because I run a 2 to 1 system. Matt Tanner is the guy for belly pans, but if you can't get one from him and you are running close to race time, just jerry rig an old baking pan and zip tie it on. Make sure it has an oil pad glued into it.
The April 15 day is also helpful. They will run your bike thru tech inspection, but will not bounce you if you haven't safet-wired everythiing correctly. Part of the class is to inform we newbies on how to properly safety wire the bike up and make it track "worthy". However, given that you and your son have racing experience already, this shit has to be old hat for you.
Make sure you check out the Turn 2 group at NHIS during the evenings. We typically have good camp fires and lots of beer. The stories are also fun to listen to as well. Make sure you pack a rain suit, it always rains at NHIS, but it is still a shit load of fun! I don't know where Three Mile Bay is in NY, but I live in Schenectady and most of my fellow Wanker Racing Group members are currently living in New York state; however, I must admit I am still all Wisconsin at heart. It is good to see another NYer in the mix.
Here are some other helpful links on building an CB Racer:
http://www.eurospares.com/350faq.htm
http://www.motorcycleshopper.com/articles/hondacb350/editorsnote.htm
Here is founding Wanker member TT (Tim) on his CB350. Watch out for him, he is fast....and crazy. But you didn't hear that from me.
Here is the wankermobile, my bike. She is fast when she is running properly, but nobody at the track knows that because she wasn't running properly all year

NOtice exhaust. I just like to post pictures of the wankermobile... Also notice, that the cinder block belly pan is not a Matt Tanner product, it is my own design.
Here is the wanker logo. Welcome to the club again. It is a blast!
Yeller'
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Ask not what the wanker can do for you, but what you can do for your wanker!
Edited by - Pete Casper on Nov 21 2007 2:48:39 PM