I know that there is a 1/4" difference in piping between the Roush V8(2.75") and V6(2.5") axelbacks, but is that the only difference and is it really that big of a difference that I cant put the V6 axelback on my 2012 RS1. Only reason I am asking is that there is a local craigslist add for a set of V6 Roush axelbacks in perfect condition for only $150. If they will fit snuggly and no issues I will definitely get them. thanks for your time.