Is there anything you can do for cars like that? New exhaust? Clean filters? Install jet engine on roof?!
Presumably a 1.6 NA engine?
Yes you can improve such vehicles but it will cost a lot of money to make little gains, and those gains will only really be of use at higher revs with the vehicle driven hard and such driving will shorten the life of the engine, such changes can make vehicles unpleasant to drive because it highlights the lack of power below a certain rev band.
VTEC engines spring to mind here, yes they produce more and aggressive power when the revs are high enough to bring the second camshaft profile into play, but not everyone wants to have to keep the revs up above 4k or whatever it is in order to make some decent power, i personally dislike this type of driving and would not want such a vehicle for myself, i want full torque available from just above tickover and not in the least interested in going above 3k rpm.
It's relatively easy to improve the power output of a turbocharged engine, albeit at some cost to emissions as it almost always involves putting more fuel through, remapping can make turboDiesels in particular more pleasurable to drive in that the annoying flat spot before turbo spool up revs can be virtually eliminated.
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