I bought my FD used and im not sure if it has the stock ECU or aftermarket ECU. My boost gauge shows 13psi. i read somewhere that stock ecu cuts fuel at 11.5 psi. Is there any way to find if i have the stock ecu or aftermarket one?

 

Pull it out, look for stickers from aftermarket companies or if the screws have ever been removed.

 

Do a search there a lot of threads with pics and good info on the subject.

 

Probably won't be a sticker on the outside. You'll probably have to open it up..