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Our friends in the USA have been tinkering with ISFs for a while now, and although they have been able to add the odd 100 bhp or two, this has been found to make almost no difference to performance which at the power levels involved is limited both by aerodynamic drag and losses in traction through tyre-slip. Extra power will simply wear tyres out much quicker using a lot of extra fuel in the process. A fairly radical redesign would be needed to gain appreciable better performance using a lot more power and improved traction and more slippery body-shape techniques such as done in the Veyron.

I think that puts the value of new headers into context. Similar to that of go-faster stripes.

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catch a grip. 30-40 bhp for only £1000. i think you would have been better with the is220 f sport. Extra power will simply wear tyres out much quicker. this made me laugh still laughing. your the rod

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