Headers & Exhaust


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**All connections should be soldered and insulated with electrical tape or heat-shrinking tubing.**

1.  Find your secondary O2 sensor(s).

2. Establish which O2 sensor wires are Signal, +12 and Ground. Either use the bottom of this page for color codes of most factory oxygen sensors or use a factory service manual for reference. Chilton’s or Haynes manuals can be found at your local library and auto parts store.

3. Verify +12V wire with a voltmeter by probing the wire while the car is running.

4. Verify the Ground wire by measuring the resistance or continuity between the wire and chassis. The resistance should be very low. OR Connect the sims black wire directly to a good chassis ground.

5. Turn off the car and disconnect the Negative battery terminal.

6. Connect (splice) the O2 Simulator Black wire to O2 sensor Ground.

7. Connect (splice) O2 Simulator Red wire to O2 sensor +12V.

8. Cut the sensor’s signal wire completely.

**The side that leads to the O2 sensor should be taped off. It will not be used.**

NOTE: If you have single exhaust and/or only one secondary O2 sensor, you will only use one of the Yellow wires coming from the O2 Simulator. Cut and insulate the remaining Yellow wire.

9. Connect the O2 Simulator Yellow wire to the other half of the signal wire that leads to the ECU. If you have two secondary O2 sensors perform steps 8 and 9 with both sensors.

10. Reconnect the Negative battery terminal.

11. With the car running, the O2 Simulator LED should be slowly flashing.


Member Credit: Brandan Nankoo,
Mishimoto Photo Credits: Sunday Ortiz and Gerson Flores

No one ever wants to experience the feeling of having to replace a CVT Transmission. Under warranty, it’s not so bad. But out of warranty, it will be a very expensive job. To prolong the life of the CVT, many members have been installing external transmission coolers.

You have various options when it comes to selecting a Transmission Cooler for your 2009-2015 7thgen Maxima. Two of the most popular ones are the Hayden coolers which are universal and applicable to all vehicles and then the Mishimoto coolers.

Please note that you will need an extra quart of Nissan NS-2 or equivalent.  

Hayden Automotive Rapid-cool Cooler #677 ($35.00-40.00)

These are very inexpensive and work very well. All rapid coolers include the patented “Flow path design” which increases heat transfer while minimizing pressure drop.

Mishimoto WRX CVT Transmission Cooler 2015+

These are much more expensive and also work well. The best way to purchase these is via a vendor who can get you a great discount.

Tools Needed

Prep for Installation

1. Jack up the front end

2. Follow Markos video on how to remove the bumper (video below)

3. Blow out Trans cooler to make sure there is no debris inside of it.

Installation (The instruction use the Hayden Cooler for reference)

1. Drill hole in plastic like in the picture below

2. Route hose through top of the crash bar in between headlight and radiator

3. Pull hose through bottom hole beside the wire that leads to crash sensor

4. Apply a bit of CVT fluid to the inlets of the cooler (this helps the hose slide on better

5. Put the clamps on the hose and attach to the cooler (tighten clamps)

6. Place the foam pads on the back of the 4 corners of the cooler (supplied with cooler)

7. Attach the bottom of the cooler with the supplied zip ties

8. Zip tie each hose with the long zip ties. Top one is tied together with the cylinder beside the ac condenser and the bottom to the wire beside it (reference pics above)

9. Cut hose in half using knife

10. Place pan under car

11. Disconnect factory cooler line from radiator which is located on the bottom just above radiator hose (factory clip needs to be squeezed with a pair of pliers)

12. Connect the line from the top of the top of the cooler to the bottom of the radiator with the new clamp
13. Disconnect the other end of the factory line (has the same style clip as the other factory one)

14. Route the other hose coming from the cooler to the end of the factory line and tighten the clamp (make sure there is no kinks in the line)

15. Double check all connections

16. Lower the car but don’t put the bumper on yet

17. Measure how much fluid came out when disconnecting the line

18. Remove CVT dipstick and add the same amount of new fluid that you measured of the old plus add approximately 150ml extra to accommodate the cooler

19. Start the car and warm up to operating temperature

20. With foot firmly on brake run through all the gears

21. Turn the car off and double check the level is in the proper range and add if needed

22. Check for leaks

23. Put bumper back on

24. Recheck all connections after 100 miles

25. Enjoy your new trans-cooler!

Additional Photos (Installation and Position of Mishimoto Cooler):