#1 Brakes — dealer installed Hawk 5.0 pads and I could feel a significant difference, mostly in modulation but also greater stopper power (5%? 10%? hard to tell). The next day I installed the DDMworks master cylinder brace and the brakes felt rock-solid. Excellent pedal feel, quick but not excessive bite, overall a much safer-feeling experience. The stock brakes were sort of a toggle — off off ON! — which I found difficult to get used to. Pleased with this fairly moderately priced upgrade, especially where control and safety are involved.
#2 CAI — bought the stock unit that now comes on the ’19 SLRs. Power gains, if any, are very modest but I love the improved feel of the midrange RPMs — say, 3-4.5K — and that nice little growly note like my giant tabby purring on my lap. The only other engine mod I would do now, besides cosmetic, is Bob’s MEFI tune.
#3 New battery, tender/charger, emergency battery-powered jumper, and battery jump/charge ports in the back quarter panel to keep all this sh*t from happening again!