Invidia Q300 Quad Titanium Tip Cat Back Exhaust WRX/STI Sedan 2011-2014 | HS11STIG3TInvidia's new Q300 catback exhaust system for the Subaru WRX and STI sedan provides a great alternative to the standard N1 style exhaust system without compromising power or quality. Traditionally, if you wanted a quieter exhaust system, you had to sacrifice performance to get there. Not anymore. Enter the Q300 series performance exhaust from Invidia. Q300 exhaust systems utilize specially sized resonators and muffler baffles to maintain power output