every car and every intake system is diffrent...but expect about the same in the guesstimate area of -5 - 10 for the cheaper intake models. you could always make your own intake for "cheap" power.

 

intake on ebay you can get one for about 15-30 bucks

 

Replace spare tire with fix-a-flat, remove A/C, remove p/s, run stock tires with no hubcaps, remove passenger seat, remove rear seats.

 

Like others have said.....N20 is the cheapest power adder...Intake, exhaust, and header will net you about 10hp..max....thats $800 for decent parts....But you'll need them (exhaust and intake at least) if you want to make any kind of power.....

 

if your only looking for 10 to 30 hp i wouldnt worry about it. your not gonna feel a dramatic difference from that small a boost in hp. Your better off investing in your suspension. That will make a difference your more likly to feel and enjoy more then 10 to 30hp