aFe has a new cat-back system for 1999-2004 Toyota Tacomas with the 2.4- or 2.7-liter inline-four engine. The 2.5-inch MACH Force XP exhaust is said to uncork 6 hp and 7 lb-ft of torque. It's made of mandrel-bent 409 stainless steel and has a polished 304 stainless exhaust tip. The system's free-flowing stainless-steel muffler is also designed to absorb high-pitched tones, OE-style hangers, and all necessary hardware, and uses all factory mounting locations. MSRP: $362