Originally Posted by RemlapaN
Cams tend to make it spool later, not earlier. If you're spooling at 4400 now, expect to see full boost at 4650-5000 depending on cam choices.
That can be true especially if they are big duration 280+ and if they are not matched well to the turbo. If they are matched up well and everything is balanced out well they can help spool. My XTI with 264 Kelford's spools my Dom 3.5XTR like its a VF. I am going to overlay my current build with the Dom 3.5XTR over my stock EJ255 with the VF48 and I'll bet the stock build curve will fit almost completely inside the current build!