To be blunt, you won't get 10% improvement for $1,000.
An exhaust with more free flowing mufflers, a new K&N air filter and a fill of fully synthetic engine oil will both free up some kilowatts while also assisting your fuel economy (the oil will help immensely)
Running it on 98RON fuel will also make a difference too.
All that for about $1,000.
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2012 Mazda3 MPS 
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