I got everything on your list, lol except the Battery indicator, plus I use High-tec Servos, & run my tanks dry. Good list. Ohh and I got Blue Groove wheels & Tremor Phaltlines instead of those. I run the HPI sway bar on my Off Road Truck, but I much prefer the Blue Groove Sway bar kit on my RR Truck.
I run the HPI XL Tuned pipe on my buddies Savy that I basically keep at my place, its better then the Plastic pipe. I run a ERCM 221T Pipe on mine. 221T ERCM Pipe, if you can afford it, this is the only way to go as far as tuned pipes, it is THE tuned pipe. Nothing compares.
I do not have and wont ever run a Diff locker.
I've had no issues with that spur so far pulling mad wheelies on my FLM LCG Savy that's ZR30X Powered.
The XL Clutch set is the best from HPI, but damn expensive, the Integy kit believe it or not has been Proven in modded Piccos, but I prefer my Dynamite max Life Shoes with Ofna 1.1mm spring combo.