6.5 turbo waste gate

[93punow]

how does the waste gate work on my 93 6.5?

[Inspector]

Exhaust gas pressure in the turbine forces the waste gate open against the spring can on the fwd end of the linkage at a predetermined pressure set by that spring can.
On your truck it is typically around 7 pounds max psi that the gate opens to slow the turbo down and maintain a boost pressure.
There are after market adjustable units that can be installed to bring the boost pressure up. See the advertiser section here on the Diesel Page.
Denny

[93punow]

will the wrong muffler affect the boost.

[DmaxMaverick]

Yes.
A restrictive muffler can delay the boost (slow spool-up), and if it is very restrictive, can reduce available boost and cause high EGT's. Back pressure is neither required nor desired on a turbo equipped engine. There is no gain (low end torque) like you would have with a N/A engine.

An ideal muffer (if you can call it that) for turbo Diesels is the flow-through types, similar to a glass pack. The bigger, the better....and noisier. It is just as important to have an exhaust system capable of flowing exhaust gases according to your power/heat output. A more efficient exhaust sytem will reduce EGT's, allowing for more power output, and faster spool-ups.