My M3 GTR streetversion had 380hp stock. I then modded it completely and returned it back to stock and now it has 417hp stock. I will check to see if it happens with other cars.
03 ///M3 SG
Bilstein PSS9/ TMS RSM's/ Autosolutions Ultra SSK/ TMS Sways/ SuperSprint Exhaust/ SS X-pipe/ R.E. TM's/ OEM CSL diffuser/ Recaro Sports in custom black suede/ OEM CSL brakes/ TMS rear camber arms/ Camber plates/ rear trailing arm bearings
Did you port/polish it? That could account for the change that you can't really return to stock.
Oil change?
or full engine balancing?
I SC my z06, I than did a NA stage 3 engine tune. You cant have SC and stage 3 tune , but the stage 3 tune gives you more HP.
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