2017-2019 Toyota GT86 Aftermarket Parts Difference
 

2 Seperate Questions: I was under the impression that there are no mechanical differences from 2017-2020. Why do some aftermarket parts on not just vividracing, but all aftermarket vendor sites. Example Performance Valve Springs and Titanium Retainer Kit from Kelford fits 2017, but not 2019. What is truly interchangeable? IF there is really no difference the aftermarket support for a 2019 should be the same as a 2017. Also Second Question: What is the stock factory OEM pressure rating for 2017-2019 Toyota GT86 valve spring?