The actual HORSE POWER for M52B28 in N.A modecan reach high as 280bhp +/-, equavalent or near M3 rate.:love:release such horsepower without alter the size of engine., engine size remain in 2.8Litre::love:First: change the OBDII system to OBD1 system (full exhaust system, DME, wiring,software) unlock additional 25bhp+/- :top:Second:change the M52B28 OBDII manifold to M50B25 OBD1 manifoldwith the conversion kit. unlock additional 25bhp+/- :top:Third:Install aFe performanch Cold air intake system. unlock additional 25bhp+/- :top:Fourth:Replace the Pulley system to TMS Underdrive power pulley system and steward high-performanch water pump to reduce auxiliary drag, unlock additional 15bhp+/-the horse power will be near or equavalent to:e36 s50b30 M3 (stock), mitshubishi EVO 1-7(stock), Mazda Rx-7 (stock)manual gearbox sure :top:, but with autogear the car need to reduce the weight to optimal, not too heavy and not too lightweight.