Hi,
Be very weary of HP claims by AfterMarket Suppliers. Many claims just don't hold up in real life, or occur high in the Power Band usually sacrificing some in the Low to Mid ranges.
As stated, 10% is about as good as you can do with copious amounts of $$. Personally, I bet the figure is closer to 8% unless you get really radical.
Just because you see some color glossy Ad, or read some Professional Copy doesn't mean that you'll get what your paying for or even make the Car better - which would be the whole point...
Happy Motoring!... Jim'99
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