Can someone help?? Question about the BLOW OFF VALVE

I have a 91 GSX with gm maf sensor. Piping is all custom. I was wondering, do I install the Blow off valve before or after the maf sensor???? Does it matter?? Or can it be either way??? Anything info will help.  

The BOV goes before the MAF, bud.

Actually, you can put it like I stated above.  That will allow you to vent the BOV to atmostphere.
You can put the MAF in front of the BOV like the stock setup, but you will still have to recirc the BOV, just like the stock setup too.

can you post pictures of ur set-up? u said the pipes all custom made?