Thema Turbo 1992 chip?

[Villads Bønding]

My Thema Turbo 16 from 1992 has 177 hk. I am looking for a "chip" that will increase power to around 210-220 hk. Dastec makes a so called "Unichip" that will do the job. It will not replace the original chip but is an ekstra box that will suplement the standart ECU. Does anyone have eksperience with this or other kinds of "chips" for this car? The so called "superchip" for this car is simply a bleeder valve. My bleeder valve has been working fine but i would feel more "secure" with a "chip" that will cope with boost pressure, fuel and ignition. Also i get a big boost at 3000 rpm and i hope that a "chip" will make the hk curve more "smooth".
Some people sugest that i also fit a blow off valve. I think the car has a small one as standard? Is it a good idea to fit a new and better one? Shuld the air be recirculated to the air intake or just let out?
Thank you!
Yours sincerely
Villads Bønding