I used to hotshot and I spent a fair amount of money on a couple of 06’s back in the day. But things change and now I’m working with an 03 555. With the 06 I ran the stock turbo boost fooled of course. Then tried a HTT 62/65/13ss. While trying to figure out the slow spool I ordered a 12 cast iron exhaust housing. So I ran it both ways. Later I decided to try a SD 2nd gen mani with one of their 63/68/14’s(not sure what ar I got. It’s been over around 10 years ago and my memory is fading). I remember liking the E.D. setup the best. My 03 is currently bone stock. Well It has an intake and a 4” exhaust. This thing is embarrassing underpowered as anyone that has been around a modded common rail knows. I’m looking to fix that and want to know how much better these SXE turbos are. I’m trying to decide if I should stay cheap and get a smarty touch and maybe grab a 351, or step up the fun level a bit and get one of the newer SXE turbos with the help of HP Tuners. So would a 364 spool like my old 63 only have more top end? Would a 62 match my old 63 on top with better spool? Can anyone tell me just how much better these things are?