I’ve always had a soft spot for the Mitsubishi Eclipse. Not only was it my first car, it also introduced me to the world of mods and wrenching on cars. So when a super clean, lowered 4th gen Eclipse rolled into the shop on large 20” Foose wheels, with equally large brakes and calipers, we couldn’t help but stare in awe. But what was more awesome was what the owner wanted to do with. Summed up in one word: Everything. Make it go fast and break the 300whp mark. Who are we to say no to such a goal?

With so few examples sold locally, you can imagine that upgrades for this car is next to none existent. A plan was mapped out to custom build everything in house here in SpeedLab . Things to do include making a custom K&N intake, custom high flow headers, a full custom exhaust and a big shot of Nitrous Express to get us over the 300whp mark.

But before starting anything, a baseline was done on the dyno to see what kind of power it made stock. The 4th gen Eclipse is equipped with a 3.8L MIVEC V6 engine similar to the Pajero and factory rated at 260hp crank. Our Dynapack dyno says 210whp and this figure is just about right, given that this is an automatic car.

Once we had our baseline, it was time to start modding.

1. We start with the most complicated of the components, and in this case, it’s the Nitrous Express Proton system, with not just one but two nitrous tanks.


2. Time to take out the stock stuff. Here we have the stock air intake.


3. The stock header system.


4. The stock muffler.


5. And the stock midpipe.


6. Our Eclipse actually had some audio worked done to it already. We decided to put the two bottles in a V formation and mock up the plywood panel base with some cardboard.


7. We then run the main nitrous supply line under the amplifier box to the front.


8. The nitrous line runs on the same route as the audio power cables seen here under the fender.


9. The pile in between the bottles is the rest of the nitrous system to be installed.


10. We wrap our ¼” plywood with the same felt fabric that’s found on the amplifier box and drill holes for the bottle brackets.

11. Here are the brackets bolted in place.


12. Next up we prep the solenoids for installation.


13. With the intake box out of the way, there is actually plenty of room. We mount the solenoids next to the ECU.


14. The fuel line was tapped for a T fitting that will supply the additional fuel when the nitrous is activated.


15. Here are the nitrous and fuel lines that will screw into the nozzle.


16. Every Nitrous Express kit comes with a bunch of nozzles jetted for different power levels, ranging from 30hp all the way to 150hp! For our Eclipse, we chose a very conservative 50hp jet.


17. Nitrous Express Shark nozzles outflow the competition.


18. Now all we’re waiting for is the custom intake tube to mount the nozzle.


19. After waiting a couple of days for powder coating, our intake tube is nice red and very shiny!


20. The nozzle is mounted underneath the intake and at least 6 inches away from the throttle body.


21. Now that is one pretty and intimidating sight! Everyone who saw this setup in the shop only had !$$%@$#  to say.



Stay tuned for part two!