I was curious to know. I had purchased my civic and it already had a greddy kit on it. Its a D-series. How would I go about telling if i have a 15g turbo or a 19t which was offered later on? Simply by looking at it, it says TD04H on it but if im not mistaken both of them have this on the compressor housing regardless. So how would I tell which one I got. Also is one better than the other? Any help would be appreciated. Thanks!