I've not long done the Hondata mod.
First of all, I did not notice any difference to performance or induction sound what's so ever. Perhaps in the autumn/ winter months when the air is colder and denser, there may be some sort of benefit. It's free, so I suppose it was worth doing.
Some advise would be to have a grinder with a cutting disc on it handy. The plastic in there is as hard as a whore's heart ! It's doable in an hour with a grinder. Tin snips wouldn't even look at it. I didn't even bother with a hacksaw. It's tight enough when using the grinder.
The thick piece of plastic that shrouds the filter from the rest of the box splits into 2 pieces if you cut down too far. I found that it left a split in the plastic that could draw in minimal air from the under side of the box. I had a blow torch handy, so I heated up the 2 sides of the plastic and used the end of a metal file to seal the split using the melted plastic. Maybe a little over kill, but I thought it better to do the job right. its not hard to do this mod, it's just messy and time consuming if you don't have the correct gear. Just make sure you get ALL of the plastic flakes out of the box before starting the car !
As as for the air intake from the front grille. I was going to replace with a silicone hose, but I decided just to cut the front out of the factory intake ( it draws air from the side facing the battery ). It keeps everything looking factory and for all the difference a piece of silicone hose would really make anyway.
Hope this helps someone !
