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Message: <blockquote data-quote="alamdamai1" data-source="post: 2780760" data-attributes="member: 60965">:hmmmm: After reading a lot of postings in other automotive forums, could i ask how do we resolve 2 problems that a car owner will encounter when he changed his stock extractor to a tuned performance 4-2-1 type :-1. Omission of Heat Shield - Without the shield, my existing carbie car stock CAI will not be able to draw in hot air during the regular morning start-up and normal cruising. I noticed this would worsen the FC as i had previously experienced before in forgetting to connect the vacuum hose connected to the CAI flap that draws in hot air from the heat shield. Upon realising why my fuel meter needle begun to drop faster then usual, then only i realise the vacuum hose had been disconnected when i service my plugs.Radiated & convected heat from the exposed upgraded extractor will also be no longer buffered by the heat shield. Would this effect the cooling efficiency of our radiator and causing our engine to run hotter and thereby lowering FC again?A proposal by a member to heat wrap the extractor was not recommended as it would elevate the operation temp. of the extractor and thereby increased its risk of failure.2. Increased in Sound - With stock or even with replacement midbox and muffler, members have experienced an increase in sound emission, hence how can we reduce the louder sound to the same original emission level before we replace the extractor? Really appreciate it if all the sifus in this forum could assist this noobie here on how to resolve my both concerns as i'm very keen to upgrade my stock extractor but hopefully would not cause another problem later..<img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/adore.gif"  class="smilie" loading="lazy" alt=":adore:" title="adore    :adore:" data-shortname=":adore:" /></blockquote>

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