I have the ECS kit and don't have any issues with it. I think people might have issues with it due to install error.
awesome, have heard of people having the pipes knock around (causing the ECU to pull timing and make less power) because the ECS kit doesn't retain the OEM attachment points, so it can bang around easier, so in my mind the EQT piping kit just seems better engineered, but if works great then that's awesome
the turbo piping kit and EQT turbo muffler delete also makes the turbo tiny bit louder which is fun too
if did both and picked up 8whp or whatever and tiny bit faster spool, I think you could feel an 8whp gain, I would bet that if a car gained 8-9whp throughout the power curve that might be worth a 0.3-0.50 more mph of trap speed, for what it's worth I have a Unitronic turbo inlet and will be installing the EQT piping kit, so I'm doing both, but I also seem to love wasting money on my car too so I'm not a good judge of money use hahah
but for sure just not doing all these little mods and saving up for an EQT turbo is way better use of $ for more power