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Changed my spark plugs today. Two were Bosch the other two were NGK. I was experiencing a lack of power from 5-6k revs or there abouts until now. I put four new NGK plugs in and the car pulls much better through the same rev range. I'm thinking this was the problem, does that make sense to...

Hello Everyone, Recently bought a black 197. It will be my daily driver but hope to modify for some track use at some point in the future. Great forum. Already found the 'how to' section useful! I'm in the South Wales area if anyone can recommend knowledgeable/reliable specialist…? All the...