Hi Peter,
I have the IPD kit on my Boxster S with the larger throttle body.
Personally, I did notice a difference in both the pick up in power and throttle response. It's not big of a gain to snap your neck like a twin turbo or supercharger, but it certainly was a nice difference. I paired it with a sports exhaust from FVD Brombacher. I decided not to get a tune until next season just to get a hang of things. I personally do not feel I need one, but may decide later on to try one out.
I asked myself "Was it even worth the money?" Well, some people will argue that it is a complete waste of money, but there is always a guaranteed smile when my foot is on the gas pedal, so take it for what you will.
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2001 Porsche Boxster S
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