Yesterday I witnessed first hand the benefits of a back to back dyno run of upgrading to the 3" Expansion exhaust @ the Specialty Z open house. Peak HP and TQ benefited, however the midrange gains are amazing! It was some were around 80 HP and TQ gains in the mid range! If they would have had the 3" in a 4 bolt flange I would have purchased it right away and gone for the stock turbo record. Would you spend $3000 on a new set of wheels and then put a 225 tire with 800utqg tire on it? Why get a great turbo and not support it? If I had the graphs I would post them for you to see. But I know they are on here. Night and day difference. Hands down do it. You will not regret it. Period.