I know of this company only through bad experiences, two of my mates had cars done by them, they were both shocking. Both cars lost power & were promptly sold.
I have done alot more mods to my 172 using parts from reputable companies eg hill power, it still only produces about 185 bhp.
How the f**k they manage to get 200 + bhp is a mystery, i think someone should contact the magazine to throw light on their practices.
They certainly will not be getting any of my cash, until they can independently show the BHP figure.
I can remember seeing some of their cars tested in magazines, they normally come in well below standard power & then make up some garbage excuses.
If the advert advertised more torque or driveability then this may be achievable, but not 200+ BHP.