Vehicle modifications can be great - or they can become expensive liabilities if you don't do your homework. In today's episode, we break down mods that help versus mods that hurt, based on over four decades in the automotive world.

From performance upgrades that void factory warranties, incorrect tire sizes that cause transmission and driveline issues, suspension lifts that create steering and drive angle - problems, to ECM software changes, remote starters, lighting upgrades, window tint, and aftermarket electronics - what you add to your vehicle can have real mechanical, legal, and financial consequences.

We also talk about why some modifications may be legal in one province or state and illegal in another, and how poor installation - not part itself - often creates the biggest problems.

Mods aren't bad - but uninformed mods ...