Bob's are not adjustable.
If you want to change the angle for the lowers to get a better bite you use the relocation brackets. You need to be able to change the length of the LCA when you change the LCA angle.
I have Metco upper and lowers from Posi and couldn't be happier with my choice. Solid pieces, no wheel hop, made in America and excellent customer service from Posi.
If you like something with a nice look to them check out the Bob's (in my sig), you can get them from Bob's Auto Sports or from Van at Revan Racing, Inc. - Performance Parts for Late Model Mustangs :beer:
whats the Difference in Weight of your lowrs vs stock ?