u/HovercraftOk3175

Long story made short, I’ve installed the s&s slip on exhaust for my sportster s. I have a slight pop/backfire only in first gear while accelerating. Other than that I’ve got popping on deceleration in any other gear. The only concerning part is the backfire upon acceleration, I’ve checked for an exhaust leak and all good there. No error code or check engine light either. Any ideas as to why I’m getting a backfire in first gear and has anyone else experienced this? Also should I get a pv4 from dynojet to tune it and would this void warranty? Thank you to anyone to who leaves a helpful comment.

This is a 2024 VW Tiguan 20k miles, got low coolant light and car started overheating pretty quickly had towed over to dealership. Main thing is it’s a pinhole leak but from the back of the radiator. Now from the video they sent me the leak is coming from the back near the radiator fan and they are denying it being a warranty fix assuming it was caused by road debris impact. Am I wrong in assuming a road debris impact would cause a leak from the front and it’s a possible part defect that caused this. I’m asking for pics once the radiator is out but any input would be appreciated thank you.