Big 3 upgrade ???
 

Has anybody done the big 3. Or if anyone can point me in the right direction. I haven't been on the site in a while

I have no clue what you are referring to

confused I am.

pretty sure the OP is referring to this...
KICKER BIG 3 KIT Sonic Exclusive Big 3 Upgrade Combo Kit

and no I have no idea OP. sorry :(

On this forum that's: cat back, intake, and oil cooler :tup:

It is merely upgrading your ground wires from battery to chassis, engine to chassis, and power wire from alternator to battery. Its an audio tune up for cheap factory ground wires. Its a step I always take on my own vehicles.

I know what you are talking about. I was running a Jl 300/4 (left over), replaced with a JL XD500/3 and now a JL XD700/5. I've had no dimming or power problems what so ever. Even cranked to the max with the AC on. But on other cars this has been an issue and the first thing I did.