I have a custom stainless 2.5" exhaust with two straight through Magnaflow mufflers on my 04V70 2.4 non turbo. Zero popping or backfiring at all. It sounds absolutely glorious above 5k rpms and it's not to loud just cruising around. I believe the turbo cars will pop on deceleration depending on the blow off valve it has.

 

My 2.5T burbles a little on downhills with the ipd oval exhaust. The only thing I can’t stand is the resonator which from my experience, does absolutely nothing


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Yeah the resonator is useless. I don't particularly mind the drone and the burbles/pops, but I could see how the drone could be annoying on a long drive


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Typically, a car that pops TOO much is an indication of a poor tune. Often times that happens when people mod their cars but don't update the tune to adjust for the new bits or have a tune done... poorly. Have you applied an ECU tune yet?

 

Tune is 100% stock, only mods related to the engine/exhaust are my catback. Car was 100% stock when I bought it. I was thinking maybe a leaky injector? Unless it somehow has something to do with my intake since I'm just running an open cone filter. Not sure though. If I blip the throttle at certain RPM's in 2nd, 3rd, and sometimes 4th gear it'll cause some loud pops while certain RPM's in 2nd and 3rd will cause burbles/pops while coasting downhill.

It's honestly not an annoying thing, I absolutely love it. I just wanna make sure it's not harming my car


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This might explain why it's more pronounced when your engine is cold:

7 Reasons Why Your Car Exhaust Crackles and Pops [With Examples] – CarsTopics

carstopics.com

It could be any number of things, so you're absolutely correct in at least wanting to investigate to make sure there's nothing wrong. Often times its pretty benign though and can be resolved with fine tuning the ECU tune to compensate for your new intake/exhuast setup. You want your engine to run as optimally as possible and work in harmony with how its breathing now, so just food for thought. A little burble and pop is certainly fun and sounds great (like you get on a Fiat Abarth), but more than that and it's worth paying attention to and figuring out.