What Mod Do You Regret?
 

I regret buying an indiglo badge at one time . . .

Things I regret buying are things that I upgraded to better products later on. Like my intake, which I bought a better one later on, and my rear ST sway, which I'll be upgrading next spring.

Oh, and my used current tires which I've had for a couple of years but which I really wish I had done more research on and just bought new ones that I wanted right off the bat (current wish - Paradas).