A question to people with modded exhaust/intake. I have been noticing this popping sound that I thought was coming from the back when im in the traffic light and rev the car to 2000-2500rpm then take my foot off the accelerator quickly (neutral or in first and moving the car slowly fwd). I got to work and asked me colleague to listen to it and it actually sounded like coming from the engine. Further investigation and it seems like coming from under the car, I'm thinking from the dump pipe (turbo back pipe). It doesnt happen if I change to second or take foot off the accelerator slowly or revving it high. I have a Miltek TBE and Forge Twintake plus APR Stage 2. Is this normal or is there some sort of a leak? I always had the crackle and slight pop coming from the back.