DOES IT REALLY MAKE A DIFFERENCE CARBON CLEANING A 150,000 MILE RS4 V8 ENGINE?

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We have spent another £1400 on the engine carbon clean and new injectors. So even though on the previous dyno run the car only managed a maximum of 351 bhp we are expecting a decent bhp gain, even though the v8 engine has covered over 150,000 miles in it 13 year life.
But the question is with how much horsepower will we be happy?

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