I got the catless AMS downpipes (in addition to other stuff that add sound/power like grouppe M air intake and akra exhaust). Have to say the downpipe is the only mod I've made that made a HUGE difference in power. However, the sound in VERY loud (embarrassing as I live in a stuffy condo building) and there is a strong smell of gas (owing to going catless). But I would do it all over again because in addition to the power, it feels like the turbos are always spooled and good to go, and the lag is gone in any gear at any rev. Worth the price but installation will take 4ish hours (I did it at a dealership and cost $1000+). Car sound post akra and gruppe M was a subtle change, the AMS catless downpipe took it to a whole new level. It would be my only mod if I had to pick one.
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