I always downshift since with the gears engaged you are in full control of your car.
When you are in neutral you cannot accelerate or decelerate with the engine so you have taken away some of your control.
Take a PCA Performance Driving school for a real eye opener on how to drive and control your Porsche.
It takes much practice but rev matching is the goal to minimize wear on the clutch.
It took me 6 months to get it perfect in my Boxster 6 speed and now I can shift smooth going up or down the gears at will.
I do still miss a shift now and then though but I just go back to the previous gear when that happens and try again.
When down shifting I use the blip method where enroute to the next stick position(gear) I blip the throttle to match the revs then let the clutch back in at just the right speed so that everything hooks up perfect without a lot of jerkiness.
When doing Max performance shifting it does get more jerky but smooth stick and clutch work non the less.
You never want to shift down where the new gear ratio over revs the motor.
With 6 speed that does not happen very easily unless you are way up in the revs 6500+ but with a 5 speed you may have to pay a bit more attention.
If you keep all your up and down shifts between 3500-5500 rpm you will have no worries.
Practice is the best way to get smooth, and heel/toe or blip is up to you and what you find is your prefered method.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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