Here are a few ideas that I wouldn't mind applying to my 155 if I had the money / time!!
I fancy one of these to go with the boot spoiler, but Sheffield speed bumps would soon remove it!
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Autodelta do some uprated cams and a longer 5th gear

 

I wouldn't mind some of these. The first one is Compomotive's TH2. Very Integrale style!

The second two are Speedlines, with the later being the anthracite Chronos, similar to that found on the BTCC touring cars in 1995.

On all of these, I'd go for 17" with 215/40/17 tyres

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