Your pretty much limited when it comes to power and a automatic d16z6 -_-
Upgrading from the stock header, intake, & exhaust is a good idea, but after a while you will want more power.
Starting from the firewall this is what you need to swap from auto to manual.
- Manual Brake & Clutch pedals
- Clutch Master Cylinder
- The clutch fluid line that runs from the master cylinder to the slave clinder.
- Manual Tranny which should include (VSS, Manual Starter, Clutch, Pressure Plate, Manual Flywheel, Slave Cylinder)
- Need manual transmission mount
- del Sol shift linkage from any 93-97 S or Si model.
- Manual OBD1 P28 ECU (Or I believe you can have yours chipped)
I think I'm missing a few stuff, but that's most of the parts you will need.
If you could find a crashed del Sol to use as a donor that would be much easier than piecing parts together.