The oil surge and reservoir tank on the right is supplied with the kit and is used to house the traction fluid for the supercharger. All cooler lines and fittings are supplied, and the oil lines even have an integrated in-line oil filter.
The fit and finish of all the components in the HKS supercharger kit are top notch and of OE quality.
All that extra air being pumped into the FR-S' boxer engine will get some help exiting thanks to the HKS Legamax Premium Exhaust (part# 32018-AT040). The piping is 60.5mm in diameter and is made of T304 stainless steel. The HKS Legamax Premium Exhaust is a cat-back system and is a completely bolt-on affair.
Once on the car the 124mm tips don't seem that large anymore as they follow the contours of the OE exhaust openings perfectly. You can expect a sound increase of 10dB during wide open throttle and a mere 2dB increase at idle with this system.
The HKS Supercharger Kit in its out of the box form is good for a power increase of about 25%, and the potential of making much more power is just a few tweaks away. So in order to contain its current power levels and any future increases, the Exedy Stage 2 clutch kit (part# 15953FW) was chosen for this build. The three puck cerametallic disc will grab a lot harder than stock, while the sprung hub will provide some cushion for smoother engagement while street driving.
The Exedy pressure plate is very similar to the OEM part, but it has a few high performance touches. For starters, the pressure plate increases the clamping force by about 40% from stock. A close look at the diaphragm fingers shows they're induction hardened where they make contact with the throw out bearing.
With the transmission off the car in order to upgrade the clutch and pressure plate, now was the perfect time to also swap out the shifter bushing with one from Energy Suspension (part# 8.1105). You'll be amazed at what a difference this bushing can make on shifting feel and crispness. On Project G20 Racecar we're running a completely stock shifter set up, minus a solid rear bushing and we're big fans of the combination.