Positive is a tuner that cant tune stock ECU, can use syvecs so can tune your car. There is loads of add on’s but all at cost, this the full blown can be 15K…. or so? flex fuel is a positive if your going to run different fuels
not a waste of money if you need it, think we are all guilty wasting money
some guys i know are between 30-90K into mk3’s with 2 being sold off for peanuts. Its really each to their own 
My head is ported, different HPFP to rest first he’s done of type….. 8-10 cars last month this month going or gone through sabre all totally different setups…..