In addition, the cylindrical muffler was replaced by two flame-suppressing mufflers. The exhaust system in the 1965 GT350 was a side-exit dual exhaust with glasspack mufflers. O.S. also makes required accessories for their engines including glow plugs, exhausts/mufflers and air filters. TRD offers bolt-on headers, sport mufflers, and cat-back exhausts that are 50 state emission legal. These were baffled mufflers, not glasspacks. In 1967, the company acquired Walker, Inc., a manufacturer of universal-fit exhaust mufflers and pipes. The mufflers included in these kits are often glasspacks, to reduce back pressure. Larger head pipes and larger mufflers with a less restrictive air filter all improve response. Quieter mufflers, relocated shifting and rear brake and new foot pegs. Four-into-two headers extracts the waste gases, which exit through two shortened mufflers. Hansenfutz practice pedals, Drumtacs mufflers and Tuner Fish lug locks. Modern airboat designs are significantly quieter thanks to mufflers and multi-blade carbon-fiber propellers. The player is paid with supplies such as tires, mufflers, money, medkits, fuel and ammo. It featured a pair of bulging headlamps and incorporated dual mufflers. Newly designed rear mufflers give the car a slightly deeper sound.