Not very tbh. Most people go to the 2.5 Block Aftermarket (Alpha N) piggy back and Carbon Airbox. A set of Shricks and thats still more than 6-7K worth and "maybe" 270 tops. And its all at the top end.

"Garage19" I beleive had a hand in Martin B's T34 M3. IIRC he was £1500 or so for all the bits and he did a lot of the fabricating and labour himself. Theres also various Supercharger conversions out there. Again not cheap.

Most owners do the suspension/brakes/strip thing. Not so many go mad with the engine like Cossie owners do.


As for "German Cars" in Norfolk, they've been going for years. Mainly because they focusing on 320is cars. (a 2.0 litre version of the S14 engine used in the M3 in a narrowbody E30) Never visited them, but never heard anything bad about them or their stock.