Originally Posted by or8ital
By time you buy everything you arent saving much vs spending to have it pre-assembled. Most of the preassembled packs Ive had seem done much better then Ive been able to do myself. Less solder but a better hold. Just my experience.
I'll second that. I have bought all of my prebuilt packs from promatchracing.com via my LHS. They basically spot weld the bars in place. I found out that their technique gave better performance on the track, specifically better contact and lower IR than I can get myself.
One thing to think about, sometimes I have also seen the "low solder level" bars come off when the car or truck took a really hard hit. They seem a little more prone to this than packs with "lots" of solder on them. Not terrible, a small tradeoff for much better performance than I seem to be able to get. I would check batt bars over periodically and also, just like any other car part, after any hard crash.