Aftermarket exhaust parts and the engine. However, the pipes do "ring" with the exhaust pulses and increase underhood noise. Headers can be ceramic coated to reduce the heat radiated in the engine compartment, and to increase the temperature of the pipes which increases the velocity of the exhaust gases. Terminology: Catalytic converters are necessary to reduce emissions but create back pressure due to the exhaust gases being forced through a catalyst, and therefore decrease high-end engine power. Many modern catalytic converters only produce 1-3 psi of back pressure, though this restriction worsens further with use. Hi-flow catalytic converters can replace the standard units
Intelligent Car Initiative Intelligent Car Initiative The Intelligent Car Initiative is a policy framework set up by the European Commission to tie up all activities relating to 'intelligent' automobiles. The term covers all vehicles that are equipped with modern information and communication technologies (ICT) to increase road safety and/or the flow of traffic, or to reduce the environmental impact of road transport. A well-established and widely known 'intelligent' device would be the anti-lock braking system ABS, which prevents the wheels from locking while braking and thus enables the driver keeping the car under control. An example for a more recent system would be