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Message: <blockquote data-quote="speed2horizon" data-source="post: 4507042" data-attributes="member: 30831">Simple explanation. Increase the opening duration so that more air can be vented into the combustion chamber and extract from the combustion chamber. There are different specs of highcams. And also, high cams for turbo and NA have different Cam profile.Not necessary for a racing car only. It can be used for daily driven to improve performance. Necessary of not depends on what U expect to extract from you engine.Get more power will definitely consume more fuel on top end. But not necessary when cruising when the load of the engine is minimum on a Close throttle position. There are 3++WHP engine that will cruise for 400-500KM with RM85 of RON97 fuel.It all depends on how ur tuner when he/she tune the car and what management to use.BTW, an engine durability does not affect by how much pressure u induced. It's about how many HP ur engine/crank/conrod/piston can take.There are tons of stock VR4 engine that burst within 1.5bars. But there are also some VR4 with stock internals that I know personally running on 2bars for daily driven achieving 36+ WHP. No problem at all. It all depends on what management u use and of course a good tuner.</blockquote>

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