I did the research here but did not find the info I was looking for. I come the benz world of mods and trying to catch up on the 996 world.

I see adjustable links as an option and my question is what happens if I only put 25mm sways on rear and 24mm on front (both adjustable)without the adjustable links.

 

You want adjustable links with an adjustable sway bar. Your levels of adjustment are very limited w/o switching to the proper bar.

FWIW, our bars and adjustable links were on the GT2 that just won the One lap of america.

 

According to "The Essential Companion", stock bars are 23.6mm front, 21.7mm rear. You would be increasing the rear, but why change the front for an extra .4mm?

I have the TPC adjustable bars. Pricey, but they made a nice difference on my car. Their front bar is 32mm. Casey can tell you what the rear one is.