Have seen it for sale before. Not sure regards the 274 bhp though.
Apparantley decatted and chipped, think more the same as what AndyomegaV6 has done with his facelift, and he gets the same Bhp. Only problem is being decatted would'nt pass the MOT, unless you know a friendly one like AmigoV6.
De cat & MDTM chip has'nt made much if any difference on mine, maybe a tiny bit in mid range. I only had the exhaust made (£340) cos it's a lifetime guarantee, s/steel, no cats to go wrong or incur expense...& i'm childish so like the noise.
Put it up against any other 3.0 manual & there'd be little in it in real terms. With the tyres (getting low now) & the Irmy rear springs i may have the edge on B roads, even bumps don't unsettle her 120....erm 60 mph.
8-)