Info from Spoon-Europe:

2.2 Litre Engine Upgrade Kit
S2000 (AP1)



"For all applications, as a direct replacement of the original parts, Spoon
Sports have created a 2.2 Litre Engine Stroke Upgrade kit for the popular
S2000 model. Not only increasing the torque output of the engine, but
the flatter power and torque curves with peak power and torque earlier in
the rev range, the overall driving performance is dramatically improved.
The kit consists of engine internal parts only, and results in the following
upgrades to the specification."

Bore / Stroke 87 x 90.7mm [87 x 84mm]
Capacity 2157cc 1997cc
Power 240 Ps @ 7800 RPM [240 Ps @ 8300 RPM]
Torque 224 Nm @ 6500 RPM [208 Nm @ 7500 RPM]



This 2.2 L Engine Upgrade Kit consists of the following.
4 x Pistons 8 x Circlips 1 x Crankshaft
4 x Piston Ring Sets 4 x Conrods 1 x Head Gasket
4 x Pins 4 x Oil Jets


Part Number:
13000-22C-H00 F20C 2.2L Engine Kit (Std Bore)
13000-22C-H20 F20C 2.2L Engine Kit (+0.25 Bore)


My questions:

1.What does that +0.25 Bore means. I know it's overbore, but what does that mean in real world, what is different?
2. Looking at the price of it (around 1400USD), does it sounds like a lot of and Spoon labeled OEM parts?