Yup, Turbotweak is the only way to go. Eric does great work and is a hell of a nice guy! Go bigger than you think you currently need. Pick up a set of 60's and a chip for them. They are not much more than the 42.5's (which are also out of stock last I looked) and the 60's will give you room to grow in case you get a bigger turbo or something in the future. He can burn a chip for any of those injectors and you will have smooth idle, better economy, better driveability, no tip in stumble, etc. You won't be disappointed.