When I first built my motor I was running 20w-50 Valvoline VR1.
I still now run 10w-40...thicker weight + extra zinc properties = good for the bearings and for sure makes for a quieter engine.
Also, with an aftermarket intake...your going to hear the motor more.
take it to dealer. hes says pop your hood, leave it running. i pop it, he grabs a spray bottle, and sprays the belt. INSTANTLY stops ticking and no noises at all are coming out. he says belts dirty. closes the hood. lmao. my motor is quiet as a kitten now