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The option of a lighter flywheel is going to be discussed here. There many light flywheels for d-series engines that can do the work.

All the D-series engines have the same flywheel or they are different?

Differences are there with regards to the clutch.

Not sure about the exact specs, but an ESi flywheel doesn't fit straight away, unless you also order the ESi clutch. That set should go in our S40 trannies just fine. It is somewere in the dimensions, but not sure which.

I think d16s have a bigger clutch comparing to d14. If you buy them as a set (flywheel-clutch) it's a straight fit.

D16 has a 212mm diameter clutch ,20spline.
D14 has a 200mm diameter clutch ,20spline.

This is what i researched so far
flywheel weights:

Stock D16= 8.1kg
Stock D14= 7.3kg
Fidanza = 3Kg $140
ACT prolite = 3.7kg $230
Clutch Masters = 4kg $300
Bisimoto Aluminium Flywheel = 4.39kg $230
Exedy Racing Flywheel= 4.9kg $218
ACT Streetlite = 5.39kg

I'm using the Bisimoto flywheel cause it's something in the middle and i DD my car.Fidanza is the lightest out there .
For drag racing you're better off with a stock heavy flywheel ,it gives you more momentum to launch and have a great 60ft time.
The D16 and d14 flywheels are the same except the inner surface being smaller on the D14 flywheel for the smaller clutch (200mm)

I would consider to remove weight to my stock flyweel. What do you guys think of that? I dont know if i asked this here already Cheers

It's not good idea because the balance of stock flywheel will be lost. This will have a bad effect to engine.

I'll have that in consideration but it is a common procedure round here...

im sure if you got it proffesionally done it could be balanced easily.

You could to that ,but be veryyyyyy sure you got it balanced perfectly back again.You don't want vibrations at 7000rpm or so ,that'll eat bearings for dinner.