2008 Honda Civic Si, any ideas?....?

Well, just purchased a Si, ive been lovin it ever since my purchase. im interested in tuning it up, hopefully the cheapest way. but im not sure what i should go with and stay away from. what to start with first what should be the last thing on the list to even purchase. i would prefer to make it a sleeper.. im not big on modifying the out side. all that can stay like how it is. just uping the engine, drivetrain, clutch, suspension, etc. any ideas would greatly appreciate it! thanks oh and by the way it has 40k miles on it.
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what websites could i go to, tried looking them up on google, didnt work out so well
 
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