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They don't actually switch the chips. You over-night your chip to them, the program it and send it back. Hell why not bump 390 to 410? Sure you can use it, just find an empty road outside the city. But I do understand where you are coming from.v12gte said:390 hp is already "stupid fast". It is barely usable on the street as is.
I remember having problems with cold starts after i chipped my 964 way back. The mechanic said: "What, you thought somebody could out-engineer the factory?" I bowed my head and told him to put the stock chip back in.
I am sure the vendor's chip is a wonderful product and works as advertised, but I am personally done with "extreme" mods, trying to change "well enough", and so on...