So I have been looking into upgrades and after reading on here and other things considered I am looking at a MBRP S6200409 4 T409 Stainless Steel Turbo Back Single Side Exit Exhaust System, An aFe Air Intake System and a FORD 1994-2003 7.3L TS PERFORMANCE 6 POSITION POWER SWITCH. I went with Rotella 15W45 oil and Opti-Lube XPD Diesel Improver, What do you think of going with those choices?