Here's my miata with the stock wheels and tires and hardtop.

It needed a boost in HP, so I ordered a direct port nitrous kit from Edelbrock. It's the Victor Series, adjustable from 50-200 HP.

Then I ordered a progressive controler

Also ordered a MSD 2 way digital adjustable window switch to activate tell keep the progressive controller sparying between 3900-7200. Sorry, no picture on window switch yet.

I also purchased a 300 Liter Carter fuel pump and added a seperate fuel system to the car for the nitrous. The two systems only share the fuel tank.

The nitrous system is jetted for a 100 shot. I have a micro-switch under the gas pedal and an arming switch installed in the ash tray. There is an arming light resessed into one of the eyeball air vents too.

When the system is armed, power is sent to the micro switch. When the pedal is floored, the power goes threw the switch and to the MSD window switch. If the engines RPM's are between 3900-7200, the window switch sends a signal to the progressive controler. The controler is setup to start at a 60 HP shot and ramp to a 100 shot in 0.3 seconds. This seems to work the best to get traction and it's also easier on the engine.

So far best 1/8 mile time with nitrous is a 9.38 at 74MPH with a 2.5 60 foot time. With a better launch I believe the car could run in the high 8's.

I bought a used white hardtop with a headliner and defrost for 900 dollars. I bought spray paint from O'Riely's and painted it to match the car. The paint used was Ultra Silver- T191.

An electrical problem at the track caused the nitrous system to come on while the engine was idling at 900 RPM's. It blew a headgasket. Making lemonade with lemons, I decided this would be a good time to do some headwork to gain power while the head was off. After removing and disasembling the head, I spent 35 long hours with a dremel and drill press. I undercut the intake valves and reshaped the exhaust valves slightly and polished them. I extensively unshrouded the head, portmatched the head to the intake, removed casting marks, ground the pertruding valve stem guides away, blended the seats into the throat and into the combustion chambers, polished the combustion chambers and the exhaust runners, and reduced the shortside radius.