First of all your facts are wrong. Civic 1.8 is not 150 bhp, it is 140 bhp. And no stock 1.8L Civic can hit 240 km/h, that just isn't possible from a 1.8L 4 cylinder tiny engine.
Secondly, about the design. Yes Civic is lower and more aerodynamic than a Corolla but that still doesn't make it a sports car. It is a family sedan and the 1.8L R18 is no trailblazer. It's in Pakistan only that people believe the Civic to be a very a fast sports car, delusional people.