This is very useful info, thank you!

I think this should go to the 996TT knowledge thread....

 

Well, I purchased a pair of 710N valves for $38 each and replaced my working 710A/108 valves. Both valves look identical but the 710N has a noticeably stronger spring and seals better. Now for my results

Before my car would spike to 1 bar then fall off to .9 bar from 4.5k rpm to redline in all grears. Now it still tappers down to .9 bar in 1st-3rd gear but now it holds 1 bar in 4th gear and above all the way to redline. Also, there seems to be less lag between shifts. overall, im satisfied with the improvement for less than $100

 

how hard is the install?

 

I installed some Forge's on mine a few years back and did not see a difference but for less than $200 what do you expect.

 

Using this thread as a guide and AWE's instructions, it wasn't bad; took a little over an hour.
https://www.6speedonline.com/forums/...narrative.html

 

My 710A was bleeding boost pressure at higher rpms, resulting in P0299 underboost DTC. Once the 710N was installed.... it pulls like a freight train once again.

 

How much was the valve.

 

I got the Professional Parts Sweden 710N. They are made to Bosch Spec, for all Saab, VW and Audi cars.