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What year is your Civic? Mine is a '97 and I think I have got a d14A3 engine. Stock with 75hp, but with a little engine work 90hp. Their isn't much you can find for these engines since they don't exist in the US or Japan (atleast not in the hb). So you'll have to turn to the european tuners. A few options are putting on different cams (but this has consequenses for daily driving). Someone in the belgian tuning scene has done this and he is claming a 15hp increase. A friend of mine is going to put a complete exhaust line this summer (on his 1.4). The company that does this has given him dyna charts that show an increase of 10-15hp (don't really believe this myself). I've also seen 'chip tuning' on the 1.4. Increase of 10hp. IMO, I think it would be hard getting the 1.4 over the 115 hp...
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