Need help to tune 2019 GT350 (Whipple) after engine swap

[illtal]

I asked a seller on eBay if he knows whether cats from the GT500 are compatible with the GT350, and he replied:
"They don't have the mid mount on them like the GT350."

What does he mean? Is he referring to the vibration damper?

*UPDATE* he confirmed that he was talking about damper (which is OK per my mechanic). But he doesn't know if cats will fit GT350 and he is not accepting returns. I guess I will take my changes...

There are other straight through "cats" that you can install. Are you doing this for emissions purposes?

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[Tenek]

Yes, emissions... I just ordered cats from GT550. So, fingers crossed. I will update you guys how it will go.