OK, so here is where there is a bit of controversy: I did the yellow street version, with a black Race also available... Well, if you read the description and look at the actual stock rubber mount, the yellow poly "slice of pineapple" is thicker and stronger than the stock one, of course, but it is said that you have to stack both pieces in there "insert style", but I think that the description is right in saying it can be an REPLACEMENT and you just use the same stock bolt. I got the stronger bolt upgrade and stacked them and it feels pretty damn race to me. So I'd do it as replacement to get less vibes and save your money on the upgraded bolt too... but this is all assuming you plan to stay stock turbo, so depending on what your goals are.