I had a glass pack installed in my Gen1 SWB. I like it. On the SWB, the muffler is at such an angle that it collects condensation and rusts out - never heard of a glass pack rusting out.

On my Gen2 SWB, I have headers and a 2.25" tuned exhaust. It's too noisy to cruise above 3300RPM (about 65MPH). The increase in performance and efficiency is nearly nil - not worth the money unless the rest of it is gone - lots of cracked manifolds here in Australia.

89 3L V6 5spd SWB, Aisin Manual Hubs, 2 (suspension) seater Raider in Wheeler, OR