Mods needed to support 550 WHP Centrifugal SC kit

Jayhovah

got a couple of notes from your list (all of it IMO) -

Return fuel system: You may as well just remove the AAM RFS from your list completely as it does not include an external filter, which you will want for E85 and Walbro 485.

The S1.SE is also overkill for the power you are looking for. The S1.E and FAST-500E are the appropriate choices.

Clutch: You can save a chunk by going with the Z1 clutch. I have it and it works great. You may also consider sticking with the OEM flywheel... I kind of wish I had (I got talked into the light weight flywheel by members here). I don't see much benefit, but I do hear a lot more drivetrain chatter.

Exhaust: LTH is an expensive addition that is probably not going to buy you much more performance - not to mention it is laborious to install. It is currently occupying 11% of the total cost in the way you have it configured.

Tune: You will need the 4 bar sensor in addition to the one for your gauge (which will be just for your gauge).

Oil cooling: If your car is not equipped with the OEM cooler, you will need to add one. Even stock cars without the OEM cooler probably need to add on. If you have the OEM cooler, I would take a wait-and-see approach and add it if necessary.
The oil pan spacer is only going to give you additional capacity. Air external oil cooler will also do this... I would skip the spacer.

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2013 Gun Metallic Sport - Gamma V3 Twin Turbogized
DIY Gamma V3 TT Install * Jayhovah's Gamma V3 TT Install Pic'Z and Vid'Z * DIY: Washer Reservoir for the Boosted