enjoy your heatsoak with SRI.
EDIT:
SRI, takes air from the engine bay, which is going to be hot, hot air isn't efficient for the engine. Heatsoak can also occur when you are just idling at the lights as there is no air flow, flowing through the engine bay. This can be somewhat avoided but the options either require a lot of work which once again heavily outweigh the gain.
CAI, takes air from outside the car, which is cooler than the engine bay, thus "cold", only issue being is hydrolocking, which is easily avoidable with a hydroshield, although once again this isn't 100% fail safe, especially if you are trying to drive your civic like a submarine. CAI is also susceptible to heatsoak, but it isn't as common as you would experience on an SRI.
Personally, I bought a CAI, but honestly, no offense, but the civic isn't a racecar man.
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