I haven't noticed that issue with mine. I've had mine for several years now and both of them appear to output the same light as before.
Reach out to the vendor. They should do something about it. Hopefully they send you the second generation kit which is supposed to be brighter.
Are you kidding? The understeer on the stock suspension is horrible.
I got the TRD rear sway bar and that alone made a huge difference. Car has a very slight oversteer with it and it made cornering a lot better
No! Rears are always different from the front. Rear discs are typically solid with no venting vanes in-between the plates. The fronts also have a larger diameter.
If you are doing the rear brakes, you'll want a rear-caliper tool that locks in a 1/4" or 3/8" ratchet. Remove the rear...
I did it myself. It wasn't bad but sliding the rubber grommets off the old exhaust requires a liberal amount of soap water and elbow grease. I thought the rear sway bar would take longer but that was a 5 minute job. Exhaust I fought on it for an hour.
I bought it at Toyota of Escondido for MSRP...
Throttle Body Spacers don't really do anything. More of a gimmick than a true power adder, unless of course that throttle body spacer has ports for nitrous injection ... then you might be on to something.