Sorry im still new to this autox thing
What are the classes a 350z can run in solo2?
i ran BS but now that i run test pipes, what class will i be put in now???

 

Looks like BSP. From the 2007 rules, section 15.10:

H. Exhaust manifolds and muffler systems are free, except that they
must be quiet and terminate behind the driver. Exhaust heat
shields may be removed. Rear- and mid-engine cars without
exhaust headers/manifold systems may use any exhaust system
that meets the requirements of 3.5. This permits the removal of
“heater boxes” in order to install headers on such cars.