Mine's fine, but it's not the all-in-one fixed pipe - it's a collection of 4 inch parts, 30* bend aluminum pipe off turbo to flex tube in S shape like stock, and then a spectre 4 inch slot maf pipe with sensor and a 4 inch K&N attached to that. The only thing is that every now and then it does go a bit lean at hot idle 16 afr, but I can't tell other than by glancing at the gauges and a slight rpm drop until the IAC kicks in. Throttle response and spoolup are instantaneous with my street setup - precision 39mm external wastegate with top port open, 15# spring with boost signal to bottom of diaphram using old school atr bleeder between turbo and wastegate. Keep in mind a 250+ inch build needs a hair bit more air at the same rpm than a 231, if that is the problem with low airflow over the meter which is why I'm not having worse problems at idle.
