If you mod ur car there are chances that it may stuff up, this is the hope we have with tuners and workshops that they do there best to ensure this dosent happen.

You play be prepared to loose.

If u want any performance mods done, like exhaust etc, then u will need a retune as the ecu will make the car run rich, this inturn will stuff up ur 02 sensor etc etc..

if u just want the sound, then just put on a diff back exhaust, it shouldnt affect warranty but check to be sure and it shouldnt affect performance.

Tuning ur ecu can provide better fuel economy, if u dont go too wild, so it has it benefits also.