I need to replace the ignition coil packs on my 2002 GS300 and find that there are many after market units at substantially lower prices available over the OEM parts. I am not opposed to paying up for the OEM but would like to know the best, most trustworthy sources of supply for these parts? Thanks in advance.

 

Don't replace them unless you have a specific problem that points to bad coils. If you legit have bad coil(s)
https://www.amayama.com/en/part/toyota/9091902216

I personally have given up on all aftermarket coils including NGK the quality isn't there anymore.

 

I did get codes indicating multiple cylinder misfires. I'll be changing plugs and wires at same time. Thanks for response.