to let me get a store credit...I have had the turbos over a year and they are still in the box...my mechanic is recommending the HKS over the GT675's...again I bought these prior to any other parts and not really doing my homework....I am having a blast with this I wish I would have met timz prior to buying some of my parts nevertheless it is a live and learn process....I just want to have the total package right away and do not want to start off with smaller turbos and then buy larger down the road as I see many have done ...seems as if many here on TT.net buy and sell and upgrade many times....for me buy it once and be done with it.