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1. it might freeze up your throttle body in cold climates.
2. i did it on my si. no power difference at all.
3. i've only done it to the si.
4. i'm guessing they run coolant through the throttle body so it won't freeze up in the winter times in some parts of the country. you can always reverse it when winter time comes though.
5. it's harder to do on an r18 than an si. i was going to do it to my friend's r18, but it looked like a lot of work. the bypass on the si takes like 10-15 mins.
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