We used to do loads of remaps and `proper honest engine work` by that i mean Porting & Polishing heads, Cams Lightening and Balancing, the stuff that sadly gets overlooked these day`s due mainly to cost and the fact its 2 weeks without a car, this is the way to go if you want to keep a car and drive it hard, i don`t like the word re map with normally aspirated engines i prefer `optimising the fueling` that is all we do, if you can get more air in within the safety parameters of the engine we then need to optimize the fuel to match, engine electronics do not give as much freedom as owners think, yes of course you can raise the rev limit! but software/metering units do not allways allow us to optimize fuelling that high in the rev range so basically you rev and rev the engine with next to NO gains (hence different injectors and fuel pumps when you go for big power)
The best way to go with a TS is decent Air Filter,De Cat free flowing exhaust and then a Re Map, you may gain 10BHP but it is the stronger and much smoother Mid Range you will notice and the car will be much nicer to drive.
Don`t make your TS another statistic by revving to 8k it will create loads of noise and go no faster and cause you problems sooner than you think.
Believe me 190BHP from a TS will cost close on £2-2.5K if done properly (trust me) and requires serious work, the car you will get back will be very different in driveability moving the power band higher up the rev range but you will then have stronger and more reliable internals
The 156 is a gorgeous car and we should try and preserve them by making SENSIBLE engine mods, there are so many TS failures in breakers due to poor maintenance and silly upgrades
After building 20V 5 Cylinder engines for £160k Quattro Rally cars for 10 years during the 80s and remapping the later turbo cars using my own researched and written code i thought the above summarised it ok, if anyone wants details of how remaps ACTUALLY work and the REAL benefits please PM me, i read loads of stuff on here about members being given B`$$s&&t and believing it then sharing it with others