Some racing series in Indonesia with highly modified Fits. In comparison to B-spec, these cars seem a lot faster.

in-car ISOM GT 2011 rd6 - YouTube

This particular car claims:

Engine: 165 HP at the engine
- stock L15A7 engine with oversized 0.25 pistons
- replacement air filter by simota
- front pipe, down pipe and full straight pipe exhaust by imora
- unichip Q+
- unichip throttle response booster
- mugen replacement ecu
- petronas synthium 0w-20
- shell super extra
- ACT extreme clutch set

legs: fastest time of 1:53:4 at sentul
- aragosta 2-way racing spec coilovers suspension
- 15" ssr type-c upfront and 15" enkei rp-f1 at the back
- endless/dixcel/seidoya brake pads upfront and stocks at the back
- GT radial sx1 195/55/R15
- j's racing rear strutbar

Seems pretty quick to me in the video.

 

I'm wondering if user is using the Dastek Unichip Q+ why also a Mugen replacement ECU is listed or actually used. I'm not sure if Mugen had an ECU listed last time I checked, but they were going to be offering some parts for more of a race-based Fit.

9:10 was a moment of a little ass-puckering if behind the wheel.

Love seeing Fits racing, sure they are not blazing fast, but they are very fun to drive at full tilt.