[Bcpzx3]

Here are two ways of modifying the stock intake. Sorry I don't have start to finish pictures, but I have pictures of the final outcome.

Option 1:
Remove Stock intake box and install air filter onto rubber intake arm. Doing so will give you space to mount the IAT.

Option 2:
Remove stock air filter and keeping the stock air box. All you will need to remove is the stock air filter and part of the rubber hose inside the air box. You will need pliers for this to break loose the metal bracket holding part of the rubber intake tube. After that you keep the hard plastic portion of the intake tube and mount the air filter onto that. You can put the stock airbox back together with the air filter hidden inside.

 

[GROM RYDER]

I did something similar to that mod with the inlet tube

I also removed bottom plastics looks good!!!! now I need to scoot down to the puto parts store and get a little cone for my beast.

 

[Harpo]

Please define "IAT" and give your source for the cone air filter in option 2.

 

[Dude6710]

Please define "IAT" and give your source for the cone air filter in option 2.

It's a intake air temperature sensor. Technically you could probably just leave it out in the open because it's not a Maf and doesn't read airflow just temp.

 

[moto]

There is a K&N type filter element made in Greece for the MSX 125. It replaces Honda #17210-K26-900. It's made by DNA #P-H1N13-01. Just search for DNA Filters. I ordered one direct from DNA in Greece. I could not find one in the USA. Not cheap, $106 including shipping & Eurobama rate taxes.
This filter with the radiator hose mod should flow enough air for most engine mods.