hey guys. i have a 2002 wrx sports wagon. the work done has included; (exhaust) i've removed the resinator, but kept the cats, also went 3" pipe from the cats to the rear axel then it goes to 2" pipe & to a flow master muffler. i've removed the bottom off my air box. i've added a blitz blow off valve, which by the way i dont know if it works properly. also installed is a cobb access port 2.0. now for the problem; when i get out of gear the rpm's drop down to almost 0 then its back up to 750ish, occasionally the car stalls, furthermore; at times there is back firing. any ideas? thax for your time...

 

Unfortunately its the Blitz BOV causing you stall out.

 

Take the BOV off, problem solved!

 

try keeping one thread about the same topic too

https://www.i-club.com/forums/subaru-general-30/sound-vs-performance-198514/

 

also why do you have 3" pipe then you got to a 2" pipe that does nothing for you car.