I'll be buying some lower control arms and relocation brackets soon. I have a gift card to a place that sells BMR and Spohn. I am 99% sure that the Traktek control arms on my brothers LS1 are made by BMR, but I might be wrong. Are their products pretty decent quality? I would be getting just the normal non adjustable ones. And will LCAs/brackets help traction, even without changing the UCA or panhard rod? I would imagine so, since the LCAs absorb most of the torque load. I know with 360+ ponies at the wheels by brothers LS1 dead hooks on the street with just UCAs/brackers and drag shocks.
BMR is a pretty good company though people have complained in the past about some quality issues. I picked J&M Hotpart because of their spherical ball design bushing which is more suited for road racing and autocross but that's my preference.
I have a custome rthat just ordered BMR boxed lower control arms for his Xtreme, so I'll let you know when they come in.
The Traktek parts are J&M - HotPart Suspension Products parts that are private labeled through Speed Inc.
BMR has had a pretty good reputation, however they did have a problem with their bushings. I have J&M parts and have not had a single failure. you will improve traction with the parts listed, even without changing the rest of the suspension.
