its more impressive for a heavy vehicle to run equal or faster times then a vehicle thats lighter
and as for cylinders lets nto even go there since the fact that you add a power add that is a 100% of the stock rating of your motor then you just bascially doubled your cylinders. now do the same for a much large motor
IE… 140hp 1.8 litre now boost with 17psi [example] now makes 290 hp you just doubled your output just like doubling displacment
so take a take a 405 hp 5.7 and now boost it with 17psi [example] now makes 810hp you just did the same
anytime you double a motors output or triples it you are now similar to a NA larger cubed motor