When a spoiler is installed or uninstalled, it is a good idea to adjust the tension rods for the trunk lid due to the wieght change.
Many people assume that springs need to be swapped out from a base to SH or vice versa, but that is wrong.
Honda trunks, for the most part, are held up with tension rods (or torsion bars).
There are two settings for the rods.
One for
with-spoiler and one for
without-spoiler
The adjustment is easy and only takes minutes.
** STEP ONE **
TOOLS
These are just something I found in my garage.
You can use whatever you want, but you want something long and strong to use as a lever. Ideally, you want it small so you can fit it inside the trunk. (I had a big flat head screwdriver at first and it wasn't cutting it because the handle was getting in the way.)
Secondly, you want something big and flat to hit with.
You'll see what I mean as the write up continues.
** STEP TWO **
****BEFORE****
This is a picture of my base model without a spoiler installed. Because I installed a spoiler, I want to move the tension rod to the next notch.
** STEP THREE **
CLOSE the trunk and crawl inside through the rear seat.
Don't try to do it with the trunk opened, because you'll be adding tension to the rods which will make it harder to adjust.
(forgive me - but I tried my best to take some good pictures. It's hard when you're laying down and trying to do two things at once 
)
Next, take your lever and stick it into the rods as showed above.
** STEP FOUR **
Pull the lever up to lift the torsion rod out of its notch.
You maybe able to push the lever forward to push the rod to the next notch.
If you can't, take something, such as the back end of a hammer, and hit the torsion rod into the next notch.
** DONE **
Now do the same to the other side.
EASY HUH?!?!?!