So, not Bando but my experience with OE and aftermarket serp belts. OE belts for 1zz and 2zz engines (in Celicas) are complete [censored]. There's been numerous forum posts about putting a new belt on plus a tensioner replacement under warranty and such, all to combat a squeal that develops in a very short period of time (less than a year with new belt or tensioner or both).
The only solution, in my experience with two Celicas with either engines, and countless others, is to use the Gatorback belt. It does have a slight supercharger whine under load that isn't present with an OE belt, but it will not squeal for at least 5 years solid.
The only solution, in my experience with two Celicas with either engines, and countless others, is to use the Gatorback belt. It does have a slight supercharger whine under load that isn't present with an OE belt, but it will not squeal for at least 5 years solid.