Removing rear diffuser

Those look like the right ones.  Here is a picture of an RS diffuser showing where the mounting locations are.  They will be different on your RSX, but they should be similar.  The front edge of the diffuser slips over a “lip” which holds it up.  So once the bolts are removed, the back of the diffuser gets lowered down... and then if you pull it backwards, the front edge will come off of the lip.

Charley

Here is a good picture showing the bolt locations on the RSX.

Charley

Those are indeed the ones. Thanks for the pic Charley!

So … what’s the easiest way to put it back on? Seems it would be much easier if the car were lifted - but that’s only possible with … a lift? Being that the jack point is in the middle of the diffuser?

@dwang2000, I put the diffuser on the floor under the car. Then I take a piece of 2”x 2” that is about four feet long and slide it under the splitter from behind, right in the center of the diffuser. Then I take a piece of 2” x 4” and slide that under the 2” x 2” to use as a lever point. Then I use the 2” x 2” as a lever to lift the front of the diffuser high enough so I can push the diffuser forward over the lip that holds it in place. Once the front of the diffuser is over the lip I center the diffuser and rotate it up into place and slip one of the back bolts in place. At that point it is easy to finish bolting it in place. 

@dwang2000 - I usually have the car up on blocks when I drop the diffuser and put it back on. You can do it while it's on the floor, but it is much easier with it lifted up a bit. The car isn't on them in the picture below, but you can see the general notion. Just a 2x4 that I cut up to fit under the tire and then stack as high as I want.

I use a 5 gallon bucket to sit the diffuser on while positioning it.

Another method if you're using jack stands.  

I just lay the diffuser under the car in approx the right location.  Then sit on the ground behind it, shimmy my legs underneath.  

Then lift the front up with one foot and push it into place.  Now lift the back up the rest of the way and slide a bolt in and your done.  

Helps if you have that bolt laying next to you before you start.  😉 

A couple ways that I have done, and watched others:

1. If have car lift, super easy.
2. If you only have air jacks, deploy jacks for added space to remove attachment bolts.  Lower jacks, gently slide diffuser backwards to disengage on to the ground, then can roll car forward over the diffuser to clear.
3. I watched Dealer do it this way:  lifted front with quick lever lift, then jacked rear, placed a jack stand or 6x6 block just 1/2" or so in front of lip which diffuser slides into on under gas tank.  Remove all hardware, remove rear jack, car is almost balancing on jack stand mid car,  quickly remove diffuser, put jack back under rear for stabilizing -worked easy and fast in paddock.

Well this Forum is certainly a good place to learn stuff. Seems like I’m taking my diffuser off using different approach… in my case removing the 6 x bolts that are in the vertical orientation at the rear of the diffuser, rather than what I think others here are using being the two horizontal bolts that hold the cross bar onto the rear of the chassis. See picture below. 
The process I use is otherwise similar to what others described … and I’m not lucky enough to have a house with a hoist…. yet!

- First I use the air jacks to raise the car off the floor, then place 4” thick blocks (made for the purpose) under each tyre, and lower the car onto these. Then I place 5” raiser blocks (again, made for the purpose) under the air jacks, and raise the car again. Once at this height I put jacks stands under the front of the car, and using the blocks that were under each front wheel, move these to the rear and stack them on the blocks already there (making the blocks under the rear tyres 8” high in total).  These are placed to be in a position to support the outside half of the tyre tread when the car is lowered onto them. This is important as it then allows enough width between the wheel blocks on each side to allow you to slide the diffuser out from under the car from behind (or back under the car when re-installing it). 
- I then put a couple of old couch pillows I have in my garage under the diffuser, up near the front edge, take the 2 bolts out of each side that go into the engine cradle (from above with the rear engine cover off), and then, while supporting the weight of the diffuser to prevent it suddenly dropping, take out the 6 bolts that screw in from underneath (see pic below).  Then lower the back of the diffuser a bit, and then pull it backwards until it drops off the front lip and onto the pillows.  I then drag it out (on the pillows) until it’s out from under the car. (It won’t slide out unless the blocks supporting the rear wheels are far enough apart)

- To reinstall the diffuser, I do the above in reverse. The only real difference is get a friend (or if at home, my very understanding wife) to help me lift the diffuser back onto the lip at the front once I’ve slid it on the pillows back undo the car. Me on one side, and my helper on the other. (I will definitely try Charley’s idea of using some wood as a rocker… or my feet!, making it a one person job)

Here’s one of the 4” wheel blocks I’ve made to go under each wheel (2” thick x 8” wide treated pine, wrapped in carpet and screwed together).  These come in really handy around the garage …

@rjbender - I now have nutserts like you and remove the rear of the diffuser the same way. I highly recommend adding these if you are doing it the old way with the long 6" bolts. Removing those is a pain, and you will damage them over time and have to replace them.

@trakmnky This is basically what I ended up doing.  Not sure what it might have looked like from the street/neighbors ... 🤣