well, gots about 90k on the stock injectors. I'm thinking of upgrading. What are some suggestions and how are they changed?

 

You don't need larger injectors at this point. For replacement, I'd recommend Ford SVO 24# injectors.

 

ford injectors?

 

Yep, these are great injectors. They're all made by Bosch after all...

 

where could I get these?

 

If you want to buy them new, I think summitracing has the best price on them. $220.
I've also seen some new ones go for lower than that on ebay.

Used ones you can get for $100-$175 on this board, depending on the mileage and condition.