Bringing in for warranty work..
 

has anyone ever gotten declined warranty work due to modifcations?

I have a invidia cat back, apexi drop in, and megan coilovers 2014 brz.

Depends on the warranty work done. Example, if you have lowering springs and you blew your struts early, they can deny it.

However if you have a fully built engine with a turbo and your radio breaks, they can't deny you.

It can only be denied if the modified part caused the damage.

[ame="http://en.wikipedia.org/wiki/Magnuson%E2%80%93Moss_Warranty_Act"]Magnuson–Moss Warranty Act - Wikipedia, the free encyclopedia[/ame]

I strongly suggest you build a relationship with the dealer service department first.

In the end, it's simple:

Legit warranty work = free money for the dealer, they'll take this all day every day.

Denied warranty work = improper dealer training, improper diagnosis, improper mechanic work, prior experience with "modded car bad customers", bad customer to dealer communication, dealer bias towards modified cars, or just a shady customer claiming warranty work for something not covered

Either way, you have to take a step back and look at it from the dealer's view. They service you, but they also have procedures to follow from the manufacturer to provide a service (and get reimbursed for it).

Build a relationship with a dealer first.

-alex