Remove the K&N Pod filter and put the standard box back on. Then sell the Pod Filter and buy a K&N "panel filter" to put inside your standard nissan box. This will do 2 main things:
* Keep the cops off your arse for having an exposed Pod Filter
* Get a direct feed of cold air thru the standand snorkel attached to the box.
Hot air = Bad.
Cold air = Good.
So far your cost is $0.
The next thing to do is fit a 3" front/dump pipe and a 3" Cat to your current 3" Cat-back exhaust system. You will instantly notice a difference mid-range and also off-throttle and dyno runs will show you a good 10rwkw extra power over the standard nissan exhaust, it will also raise your boost by around 2psi.
Your now up to ~$750
Next thing would be to get yourself a set of "pineapples" (http://www.skylinesaustralia.com/forums/sh...=before%2Fafter) and this will improve the backend under accelleration.
That bumps you to ~$900.
I'm sure that will cover you for a month or 2, seeya at WSID.