There wont be a problem unless you start getting some bad boost creep. If you get the power FC for example, and you have your boost set for 12psi and you creep to 14, your pushing it. Simple solution is to port your wastegate, or set your boost controller for 10psi, and let it creep up to 12.



Another potential downside is the noise level your car will puke out. Most people love it though, AND the flames, who wouldnt love flames?



But yeah, its way to risky on the stock ecu, so make sure you get an aftermarket ecu first.

 

Also,there have been alot of debates on removing the air pump clogging up the cat. Some say it does, some say it doesnt. But to be safe, throw a midpipe on there.