In many cases to get a proper alignment, you will need to loosen the compressor housing bolts (13mm) and re-clock the compressor outlet to match. This in turn is where the 1-2 psi of boost comes from, not the actual increse in cross sectional area. It puts additional load on the wastegate spring. (this was verified by Kenny D. himself) I have welded many of them on, and as stated earlier. it is NOT a simple cut and weld deal. I build a jig to properly postion the new inlet. If it is off just a few degrees, you will have a bear of a time getting it to line-up. Not rocket science, but it takes a fair amount of forethought to get the old inlet cut off in the right spot.