B5252S DOHC / catalytic converter puzzle

Hi folks,
I'm trying to determine the engine type I have.
I was told I need a new catalytic converter, and can't afford to pay
my shop 1200,00 canadian dollars.
So I looked around and found some for way less. But, it seems I need
to know the engine type I have before making the purchase.
My car: 1996 850 GLE, Engine B5252S DOHC.
Apparently, to buy just the right replacement I need to know whether
my engine is 20 or 10 valve?
Any ideas?
Thanks for your help!

In case you 2 are looking for cats, here are some that I am
considering:
for 20 valve
http://cgi.ebay.ca/CATALYTIC-CONVER...emZ130007503134QQcategoryZ33629QQcmdZViewItem

for 10 valve
http://cgi.ebay.ca/CATALYTIC-CONVER...emZ130007503262QQcategoryZ33629QQcmdZViewItem

 

That engine code is for a 10valve engine.

Unfortunately, the 2.5 10v uses a bespoke manifold / cat arrangment,
specific to only this engine. The 20v versions dont fit.

Tim..

 

B5252 means:
1st digit B - Bensin (swedish for gasolin)
2nd digit 5 - 5 cylinders
3-4 digits 25 - 2,5 liter
5th digit 2 - 2 valves per cylinder

Per Mathisen
Norway
-88 780 w/ SBC 350 TPI