you can check the codes without a scanner.
get to your ECU (below the passenger side kick panel). unbolt the brace from the ECU. there's a round screw in the ECU with a flat-head cut.
turn the car on (2 clicks). be sure your Check Engine Light (CEL) is on. take a flat head, turn the screw clockwise, wait 2 seconds, and now the CEL should be off. turn it counter-clockwise then clockwise just a little. the CEL should now flash you the codes. slow flashes are the first number, fast flashes are the second number.
if it flashes 5 times slow, and 5 times fast, that means you have no codes.
if you turn the screw in the same manner (clockwise -> counterclockwise), you'll reset the codes. be patient, read all the codes and write them down before you restart the car or reset everything.
can the engine rev that high? 8800 rpm?! i know an S2000 can. i don't think there's much power to be had past 7500rpm. please check that.
i get 16mpg on the city and 18-20mpg highway... and i don't push my car.
NA > TT Converted, OBDII > OBDI
AshSpec ECU, Stillen intake, Specialty Z complete 2.5" exhaust, Snow Performance water injection, Setrab oil cooler, Koyo radiator, Z1 intercoolers
SS brakelines, Eibach lowering springs, KYB adjustable shocks
HKS turbo timer, Greddy boost controller, Apex'i SAFC-II
JSPEC Front Bumper, Kazera KZ-A Michelin Pilot Sport
Philips HIDs 4300K