Have you ever downed several cans of Red Bull energy drink in a short time span? Let us tell you from first hand experience the feeling is totally unreal. Not that we condone this type of behavior, but your senses start to overload hard and you can't stand still for more than two heartbeats.

Now, what if there was a vehicle that r downed several cans of Red Bull energy drink in a short time span? Let us tell you from first hand experience the feeling is totally unreal. Not that we condone this type of behavior, but your senses start to overload hard and you can't stand still for more than two could overload those same senses from just driving it. The 2004 Subaru STi is that type of vehicle. Even in stock trim the STi's 2.5-liter engine can easily plant you into the plush suede Recaro seat with the stab of the throttle. The turbo sings happily to redline with each gear change, while the grin on your face gets wider by the second.

Now if you can imagine a stock STi representing just one can of Red Bull imagine what would a STi feel like on several cans of Red Bull. With the APS performance products you can. APS offers several components to help you heighten your driving experience to its fullest.

One of the key components to making horsepower is by reducing the exhaust backpressure. APS offers four different exhaust systems for the WRX. The big daddy of them all is the 3.5-inch DR Series exhaust system. Measuring a full 3.5-inches in internal diameter from the turbo all the way to the exhaust tip.

By incorporating precision mandrel bends, the smallest possible angles increases exhaust flow and minimizes backpressure. By expediting exhaust flow more efficiently the APS DR Series exhaust promotes faster turbo spool-up.

The system is constructed from polished T-304 stainless steel for increased durability and appealing aesthetics.

The system is a complete bolt-on replacement kit, no modifications required. The APS DR Series system was designed to handle 600+ horsepower and built for the serious enthusiasts.