That's not an AUM pretty sure its a AGU
AUM has map sensor, dbw throttle body, SAI, coilpacks with ignition amp integrated inside and the cam chain tensioner are different from agu to aum because aum has vvt and agu dont. Also don't think AUM were produced in 1998, it's a later engine and was released later.
That aside, piping doesn't look bad at all. Does look like its pushing on the bumper a bit though, can the core not sit any higher?
How does it drive, did you notice any lagg or loss of boost at all?