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a supercharger or a ecu tune by a reputable tuner. both of those will yield the most gains per dollar. also another option would be a ram air intake. you can make one easily for under $100 and a ram air system would not only boost hp but also increase top end power.
 

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The ECU tuner should be done by someone who knows what they're doing. I saw one of my friend's car get this treatment and it messed up his car performance because it wasn't properly tuned.
Definitely someone that knows what they're doing. I think that's why car_crazy said "reputable tuner". Also make sure they tune car for each gear. Not just use the same tune throughout all the gears. My friends car changes tune depending on what gear he is in. So that it optimizes his AFR especially when boost kicks in.

Yah I was thinking supercharging all the way. An IQ with supercharger. Look out. :)
Gazoo racing did a supercharged iQ and brought it to the Goodwood Festival of Speed. Unfortunately they didn't run the car though. I would definitely want to see an iQ on steriods. :D
 

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Cheapest would be a short ram intake or a cold air intake. Supercharging and tuning is FAR from cheap. I didn't know about the Gazoo car until now. What a beast!

Tuning is fairly cheap. Most known tuners here in Toronto charge around $500 for an ecu tune + the dyno time unless they have their own dyno. Supercharging gets you the most hp/$ and can be done relatively affordable if you do most of the work yourself.
 
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