Andy, having had the F Sport rear bar on for a full week >
and a nice road trip up the coast highway and back, I'm still glad I put the thicker, 19mm vs 16mm, rear bar on. Here is what I had said initially:
"I added the 53080 Part yesterday. I like the more solid feel the thicker bar provides. The car ride is about the same but the body roll is a bit less and the car seems to point in a bit better now. I've never had the understeer problem that some speak of. But I also try not to overdrive the car into the corners and then try to turn. That produces a self imposed understeer condition so I avoid that if possible. Thr rear wheels will always want to push straight ahead. You have to give your front tire patches a firm grip so it can turn the car, and to do that you can't over power the front with the rears IMHO... You lose to much time that way and can't turn as effectively.
I think the part is worth investing in and after running the car for two days through some fast and aggressive driving in the hills, I'm glad I did it. "
So after a full week of high speed tight daily foothill driving and a long, 100 mile, up and down the PCH road trip, I stand with my initial assesment. The car points in a bit better and there is less body roll in tight corners. I think the poly bushings help this a lot beside the thicker bar. I'm sure the poly bushings in the front would be a plus too even if the bar is the same thickness though I'd prefer to just replace the front bushings instead of paying for the bar too....
I'm going to look into the chassis brace/stiffners too...