What is the hardest part of buying performance parts online?

We built OKTAN.store because finding an interesting performance part is often easier than confirming whether it fits a specific model, generation and engine.

Our custom e-commerce flow starts with the vehicle and narrows the catalog to compatible parts. We would love feedback from drivers, builders and e-commerce teams:

• Where do compatibility mistakes usually happen?

• What information makes you trust a fitment recommendation?

• Would you rather start with your vehicle, a category or a part number?

If you have purchased tuning or performance parts online, what made the experience easy—or frustrating?