I purchased the oil filler cap from eBay for less than $20, I don"t know the size thread! Just type in the year of your vehicle. For exam: 2015 Lexus Is350 oil filler caps and click "see comparable vehicle" it will tell you the oil filler cap fit your vehicle or not. Hope it will help.
Jason, I just checked on eBay under " Lexus IS 250 / IS 350 (2014-2017) OEM Performance Air Intake Kit PTR 03-53141 for $385.00 . Hope it will help... good luck
@@michaeldao1711 thank you so much sir, I am going to get it later today from the Lexus dealership( it seems to be on sale near my location) and will follow your tutorial :)
I just checked on RC 350 forum , some of them said you can use the IS 350 f sport intake system ! you can call Lexus dealer and ask them or go to RC 350 forum to verify. Good luck