IS-F Aftermarket Exhaust

Exhaust systems are a very popular modification to performance automobiles. Most manufacturers place restrictive exhausts on their vehicles. Independent mechanics and companies developed free flowing exhausts to replace the restrictive systems. There's a lot of debate on whether or not the aftermarket systems are optimal for the IS-F because the car sacrifices so much low end torque for high end horsepower. I currently have a Borla Catback exhaust on my IS-F and I cannot say there is a speed difference, however there is a much richer tone in the exhaust.