You don't get something for nothing, so a $70 chip might end up costing you dearly somewhere else.
I don't think the things that a $70 chip can damage are less than the price of a cataliytic converter or a trashed engine.
Don't bother with the chips that fool the ECU into doing stuff it does not want to do.
Get a proper remap of the curves to suit your mods.
Its always best to get a higher displacement engine that is designed to handle the additional stress, rather than take a smaller one and try to push it to the limits.
Sooner rather than later something is going to break.
If you want max HP, buy a IMS failed Boxster and put a 3.6l in it and then you will only need half the pedal travel so you can keep up with the car.
Here is the story of a 3.6l Boxster
3.6L Boxster GT Racer
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"It broke because it wants to be Upgraded
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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)