I did some searching and found one tiny post on this topic, but I just wanted to make sure because I'm kinda paranoid when it comes to my car ;)

I just finished installing Megan headers on my car this morning. I have a TRD axleback and the rest of the exhaust line is stock atm... (Yes I sound like a Civic now, I know)

When I'm driving if I run it up to the higher RPMs I get a "popping" when I let off the throttle. It sounds like a backfire, but it's not very loud really. Is this normal? Like I said I'm just being paranoid, I'm sure.

Also, I made an anti-fowler for my S-pipe O2 sensor so I don't have a CEL, but I didn't reset my ECU by disconnecting the battery. Would it be a good idea to disconnect the negative terminal for a min or 2?

 

i have a mmw header with trd exhaust, it pops all the time. the car is just running rich. it is a small backfire.

i didnt reset my ecu either after installing the antifouler and i havent had a cel yet. its been a few months

 

sound is normal, i got it also. i like when the turbo cars do it some spit flames when they let off the gas. the ecu will learn on its own, just take it calm for a couple miles