I need a size E4 torx socket so that i can take my opti apart and replace the cap and rotor. thanks!

 

Best thing to do is get one from Snap-on.
but you need to get a deep well to get the cap off.
I got a reg socket and it won't work on the stock one.
aftermarket ones seam to have bigger holes.
cost me an opti spark unit.
cost you about 25 bucks for both.

good luck.

Chris,

 

I got this one at my local Parts Plus for $5.99