Hello and welcome!
In terms of the 1.8 turbo, there was different engine codes through the years, starting with the AGU, which yours will probably be IIRC. To cut a long story short, as the engine codes progressed, better components were used, so the later cars can achieve better BHP results, so in other words an AGU engine will be getting near its maximum at 200 bhp (unless you do some physical modifications, e.g. air intakes, turbo work etc).
I'm no expert, so have a look through the Mk4 section for helpful threads. Good luck!
PS... If it was me I would be more interested in the quality of the remap, e.g. torque curves etc. rather than max BHP.
