Started getting a sound from the engine that I researched online with videos. And someone had the same sound and it was concluded that the Tensioner was u/s or faulty. So they replaced that and the timing belt to fix the problem... my question is it just the STI that comes with this tensioner. Because my WRX does not have a tensioner for the AC Belt. The Accessory Belt does have a tensioner next to the Alternator. Just wondering if this isn't standard on the WRX or simply if it was missed. The AC Belt is tight, but just found that interesting that the location where the Tensioner pulley would be installed there is nothing present. Always interests me when there is screw holes but no part or bolts present. Thanks for any info anyone can provide.