I think the XV stuff has had it's fair share of fatigue/stress failures when put to the test. Just ask Bill Howell. He had a control arm fail in 2009 on the Road Course in Pahrump and a spindle fail on an autocross course last year in Reno. I'd wager he has the hardest driven XV system out there.
Bill broke an aluminum Upper Control Arm, THE ONLY ONE THAT EVER FAILED.
I personally removed the ALUMINUM Upper Control Arms from XV001, the FIRST car XV ever built, the car that was tested, taken to the race track, driven by editors, and generally thrashed all of its life... They were in perfect condition, but I replaced with steel replacements.
I only use steel upper control arms in my kits...
But please call Bill, he speaks highly of our products...
CR
