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I think that Clubhead has really done us all a massive favor. His data shows what pretty much every respectable tuner is telling us is true. The exhaust systems of modern cars are a significant compromise of performance vs emissions and sound.
A US spec Porsche has to comply with a wide range of State emissions regulations. It is no surprise that the manufacturers choose to sell only one model that meets even the most stringent (CA) spec in order to optimize costs. Smaller manufacturers like Porsche often even compromise Euro spec cars to conform to the most stringent (lowest common denominator) requirements.
I remember visiting the Ducati factory in Bologna a few years back and commenting to the CFO on the multitude of different spec same model bikes awaiting shipment and he replied that in a few years time they will have converged all models to one spec, to the detriment mostly of the Europeans.
Porsche are engineered to a much higher level than the average rice burner or detroit stump puller. However, their intake and exhaust sytems have to be sub optimum from a performance perspective. Also, lets not forget that we are dealing with a $40- $50k Porsche...they had to shave costs somewhere!
The interesting thing about Clubhead's data is the fact that the intake and ECU mods yielded little gain which helps the rst of us focus on the exhaust side until someone can prove that the intake boost can be had for a reasonable cost. Thanks Clubhead!
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