Now that i have FIC BlueMax High impedance 2150's, i wish i had gotten them long ago. I've been reading for years how they're basically the best injector money can buy. I had rc 550s, which were fine for my sm16g. PTE 650s when i went to a big16g. MSD 1000's when i got into bigger turbos. As the sizes went up, they became increasingly more difficult to tune properly (albeit far from impossible). Now that i've dropped 2150s in and they run beautifully with very little fuss, i regret not getting them as soon as i'd seen all the praise they were getting.