I used to have more info on this but I can’t seem to find it. It was in regards to the modifications they have done to the F6A motor. Yes this thing is still powered by a F6A!

Engine Output: 180PS / 178HP

Mods: (Posted by Autogiano https://autogiano.com/list/ma/list_mstb2.html)

• A tension rod using a pillow ball was added to the suspension to suppress unstable movement of the suspension.

• This Cara model has a 660cc engine, but the turbine has been replaced and NOS has been added.

• The RB26 crank angle sensor has been transplanted and controlled by HKS VPro.

• The transmission is a Works R cross transmission.

• Initially, the piston pin, piston ring TOP, oil ring, and rocker arm were DLC coated, but after the piston was replaced due to an engine blow, the rings were not coated.

• I think it would be better to coat the piston pin.

• The cam is a Tomei processed product, and is standard plus 8 degrees.

• The transmission is WPC processed.

• I heard that hard shot peening is actually better, but for now it hasn't broken with WPC (lol).

• The hub has been changed to PCD100 and the hub bolt has been changed to 12mm.

• Tires: Yokohama A050 F185/55/15 R225/50/15

Photo sources: http://www.speedhunters.com/2021/03/kei-attack-size-doesnt-matter-at-tsukuba/?fbclid=IwAR2MPW2Etw_kOO056t9P_RDh5LpsR-vhCWD6i6R7Chw7sTvssaxJHRp0HoM
and Decide226’s blog posts