Obviously you have tuned many variations, I have a s366 cast wheel with 74mm turbine and .91 a/r t4. It's tuned by me and my cousin has a bullseye s468 and it spools better than my s366 in my opinion, but does not pull a trailer nearly as well. I have way old RDL headers and up pipes with v-band assemblies and they leak in our cold winters. I want to go back to the basics and get a 72 vgt so I can still tow and make 650 rwhp on my stock bottom end and whistle and sound good going by buildings and in parking lots, lol. I've sold and installed a FPE 63mm cheetah and loved the sound of it, I just wanted the little bit more potential of the 72 billet at the local farm pulls and dd duties. Or I'm going back to twins, but 72 is drop in deal and twins I have to Fab again because I don't want to out my s366/s480 twins back on my stock bottom end...