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Just curious to see how that affects gas mileage and of course performance...I have an 07 SI.

 
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ive seen one at the track here in vegas it ran kinda slow imo.

 
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MPG def down a bit since larger injectors more horse gotta feed the ponies..lol i heard there was a turboed 8th gen si that only had like 220 whp .. and im n\a running 207 whp...lol.. so im not sure but im not too far from it hahaha

 
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MPG will take a hit, but it sorta depends on how its driven. One kid I know has a turbo 8th and was complaining about only getting in the teens, and then proceeded to tell me how he was doing 100+mph on the highway, so that wasn't helping.

As for performance, mid to high 200's is pretty standard for the Greddy kit. There some guys with lots of tuning that have broken 300.

 
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MPG shouldn't take a hit unless you have a crappy tune or are constantly on the pedal.

 
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with an si its somewhat hard to stay off the pedal haha.. what can i say.. i love v-tec

 
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i have 3 friends with boosted Si's and everyone has EM problems the GReddy kits are putting out around 260-270 and AJP 375-408

 
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Oh ****, its Paul

 
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why not just go with either the jackson racing s/c or comptech s/c??

 
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well u can get more power gains etc with a turbo setup rather than a supercharger...
like turbo is for serious power that can be increased over time effort or whatever u want really as in power gains... supercharger ,, eh u can do pulley, port polish, and or rebuild the whole charger .. but mostly i think supercharger is for just a gain ... not serious power as turbo can put out... but idk your choice as well as how much power u want outta the vehicle...