derrick woods
Well-known member
It gets rid of the old idler pulleys and it puts new timing components mainly it uses a Kia timing idler pulley to get rid of those old ones that have a tendency to fail due to their age if you search it on Google idler pulley upgrade they'll probably be 10 different sites show how to do it it's pretty easyWhat is the timing idler upgrade mod, I never heard of it.