I've got a G-Tech Pro RR to test HP, Torque and all that. I'd want to do some test runs for sure before installing them. My boss had a number of original muscle cars back in the day and one of the cars had something like this but you had to get out and push them shut manually. He said the HP gain was noticeable on his big block Superbird.

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If you can still see the disapointment on his face in your rear view mirror, he's not far enough behind.
98 M3 Sedan blk/blk Sold
00 BMW 540i Sold
03 BMW 4.6IS
98 BMW E36 M3 modified