they can only deny warranty claims that are directly caused by the modification, and the onus is on them to prove that the modification caused the problem.
edit: so (in theory) from fitting the springs they could deny warranty claims for rattles, faulty suspension, body cracks etc etc.....
edit 2: [insert standard disclaimer here]
edit: so (in theory) from fitting the springs they could deny warranty claims for rattles, faulty suspension, body cracks etc etc.....
edit 2: [insert standard disclaimer here]