By reducing the backpressure in the exhaust system and thus allowing gasses to escape quicker the TRD dual exhaust improves overall horsepower and torque. The 304 stainless steel exhaust not only gives you a performance edge but also looks great with two high polished tips stamped with a TRD logo. While there may be other options out there, the TRD cat-back exhaust is the only one developed with the blueprints of your original exhaust. This means unparalleled fit and finish using only the stock hangars. Personally, I don't like drilling holes in my vehicle. With the TRD exhaust you won't have to.