I have an '03 civic (D17A2) and I just don't think its worth turbocharging. I have an intake, headers, exhast..but they didn't add a whole lot of HP, mostly just better throttle response, so anyone have any ideas to add more horsepower, without taking toooo much away from the engines dependibility and without turbocharging.

$2000 budget
No engine swap

 

So that pretty much leaves you with nitrous.