Whilst I see cars with tiny engines and huge bodykits all the time. The best bit is when you get dull looking cars with decent engines.
A friend of mine used to have a Mk. I Ford Fiesta with a 2 Litre Zetec/CVH hybrid engine and a T3 bolted on (Garret that is). The car looked completely stock (save for the old XR2 pepperpot alloys) and we always used to love driving round town and pulling up next to some twat in a BMW who thought their car was the new hotness. Boy they were wrong!
I know it's childish but when you see the looks on their faces when the car they paid £25,000 for (or financed), couldn't keep up with an 18 year old Fiesta it somehow makes it worthwhile. There was usually a screaming girlfriend in the passenger seat for good measure as well. Of course, nowadays with all the speed cameras he doesn't bother anymore, he's got a Ford Focus company car now.