Re: Just bought a Typhoon with some "Issues" Please Help!!!!!!
what muffler is on the truck? you mention a clogged cat, but did you look into the reason for a clogged cat? overly rich, wrong muffler, etc? If you have a flowmaster or similar muffler you probably clogged up the new high flow cat. check it with a backpressure gauge.
check boost with good aftermarket gauge. if it is 8psi, check for the selenoid electrical connection. unplugged it makes 8psi. if it is plugged in, pull the vacuum line off the wg actuator and take it for a spin (watch for boost spikes!). if it makes more then 8psi chances are the exhaust is fine. If it stil makes 8psi, then you probably have a clogged exhaust again.