Quote:
Originally Posted by humfrz
Help me out here, if a "tune" can increase the power by say 10 HP, what is the downside(s) ....... except it messes with the warranty .... ??
If there are no downsides, why didn't the manufacturer do it ..... 
humfrz - far, far behind .....  |
The factory keeps the engine tuning a bit more conservative because you might not find always good quality fuel (premium fuel). Additionally, as mentioned already some parts might wear faster. The engine was not tested at all with this +10 hp increase. My dealer has no problem to install other components to my car (e.g., for handling), but he is strict on engine modifications. No chip tuning, no ECU tuning!
Btw., a tuned car might lose also more value. Especially after the 5+ year period ...