thinking about lower pulley anyone know how it affects ur warranty ???? look no caps today!!!!! but how about the ,,,,,,,

 

If your engine blows up, it's on you. Any engine or driveline issue could be claimed to have been caused by altering the engine's power output.

EDIT: It's *likely* on you, unless you can prove it's not. Generally, the manufacturer needs to prove the modification caused the failure, but for some failures, that's going to be difficult.

 

You're not likely to have a problem, but it voids your warranty if you do.

 

Read this thread - downsides of tuning

In general terms, don't expect warranty to cover any engine-related repairs once you tuned, especially once it is something expensive and requires investigation prior to warranty work.