Welcome to the SR20DE world Jethro.
I drive a '93 NX2000, the predecessor to the 200SX SE-R, I've had it since it was new. Here is a mod I did to the front of my car:
Undertray Trashed? Make Your Own! - SR20 Forum
Even with all of my power modifications (making about 165 at the crank now) I average 29.5 MPG and got over 33.5 MPG on a 395 mile highway trip on Monday with the above undertray mod, air deflectors in front of the front tires & suspension arms and inflating the tires to 44 PSI. I also used the Driving With Load Technique and keeping an average of 73 MPH.
The nose from any B14 (95-99) Sentra will fit on your car without modification so start checking your recycling yards!