Today i had a catless DP installed and wow, im so glad i did. $145 install and i LOVE it. It is louder as people mention, and more so with certain exhausts (i have an MBRP), but you can also hear a the turbo spool now, although faintly compared to the loud exhaust note. Boost also seems to build faster now due to freeer airflow so it's more responsive. Lastly, unless it's min imagination, there seems to be a bit more decompression when letting off the gas which i dont mind. Ok one more thing, the sound is freaking amazing, far less smooth muffled sound, it's got a sharp raspy edge to that low rumble. Sounds like a legit rally car now (along with other mods).