I bought my mk4 Golf for £6k, spent £6k heavily modding it and sold it for £6600 around 18 months later.
Went for the lot, coilies, bodykit, wheels, recaro leathers, exhaust, ICE, Air Filter, even had it remapped even though it was a 1.4 and fitted a 1.6 head for some extra oomphh!! (around 20...