sorry, this is kinda ot, but who are you referring to? not trying to be rude, i just want to look it up. is it a /63t conversion car?
nightmare, unfortunately for you, these guys are right. in your head you'll "feel" more power, but its not likely going to be anything realistically noticable. the reason most hondas sound the way they do is the small displacement, plus the v-tec, plus the lack of a cat, plus a crappy muffler design on ther cheap cat-backs. a higher flowing catalyst and larger exhaust piping will make the car more volumetrically efficient, but again, not very noticable except in the mpg category. naturally aspirated engines, especially four cylinders, require very heavy modding along with complex pcm tuning to achieve any big results
and op, i know your initial question was about mpg, and that is an easily definable number which, with conservative driving, should increase with the addition of a cai. all cars respond slightly differently to mods, some better/some worse, but the overall end result is usually very similar.
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