u/Aggravating_Job_5848

I just bought a 2023 model with just a cheap eBay sc project and it keeps popping heaps on deceleration only starting at 3k rpms and below and I was wondering if anyone knows what the problem is
I’ve already changed the exhaust gaskets and put exhaust sealant on the mid pipe connection and the can connection as well I got a tune first as I though that was the reason but that hasn’t fixed it
Any help would be really appreciated as I can’t find what the problem is
Thank you