blown engine?
 

I just installed the apexi single a few weeks ago, and things have gone south. I was driving around yesterday, and all of a sudden I had half power.

I can still start the car, there are no fluid leaks, and there is no smoke (beyond what is normal for a fd w/o any cats). there are no "funny" noises, but the car just sounds like it is missing, and power is way down.

any ideas?
ignition coil?

you probably blew a twin orso, not sure.

what is a twin orso?

*head is up ass* ignore me

check for leaks in in your lines.