Worse than stock.
I have to say, I replaced my spt intake with this one in hopes that it would help the high maf voltage I was getting. After install and tuning it was throwing a cel for mag high voltage. Come to find out it flows less grams per second than my spt intake. "Mishimoto designed this intake to be as non-restrictive as possible, featuring a straight 2.75" short-ram intake pipe and designed with maximum airflow in mind. Engineered to fit on either your stock or Mishimoto turbo inlet tube, this intake is also compatible with most aftermarket front-mount intercooler kits. Due to the size of the intake pipe, a retune of your vehicle's ECU is necessary to keep your engine running safe and extracting the most horsepower from the added airflow." This quote from the sales pitch is a crock of huey. Don't waste your money and get something else.