why bash?

it wouldnt effect ur aerodynamics...
as for which engine is better... search

with all the innovations now a days... swaps have been easy... depends on ur preferrence... with me on the straight, id go with an h22a or K20 Type R... On the curves... B18C Type R or K20 Type R....it all depends on budget and goals

btw im talking all motor here... with boost and other factors... u can go with other engiens too... like i said... the possibilities are there as long as u have goals and a budget