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They're attacted to a set of itb's/ individual throttle bodies. in mine and flynns case they came stock on the engine we have (4age 20v) Others have used bike throttles and made adapters to fit them to the 4e/5e.

Pros,

throttle response

Top end power

tunable torque curve by varying trumpet length

sound

Cons

hard to get idling/running right due to poor map signal supply (vac chambers help here)

Fuel economy

if ran with no filter posible engine damage

cost per gain its usually quite expensive.

Ideally itb's suit a cammed, high comp engine the 4e is almost the opposite. A 5efhe on the other hand is a much better place to start

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