Reinstall one of the catalytic converters, as soon as possible. You need backpressure to bring your boost under control----if you keep seeing 15-20 psi you are going to blow your engine.

 

Just wondering if you ever figured out for sure what the problem was with no boost after warm up, i have the same problem. I dont have the double throttle i took it out because i went non-sequential, so have have my boost controller and a lot of things blocked off. I am running a PFC. The only thing that i could really think of was something with the temp. When my car is warm it almost seems like it is hitting fuel cut. -- Fuel pump is good, no leaks, i have tried almost everything. If anyone can help i would appreciate it

Landon