The computer from the factory opens the wastegate below 4,000 RPMs to slow spool up and restrict boost level. Buy a custom cal, not a Mopar performace cal as they do it too. The FWD cal with an auto trans rocks.
if you let off the gas hard after boosting you'll here a surge through the compressor of the turbo because the T2 cars didn't have a BOV.
A brand new S60 turbo does have a larger compressor, true, but the turbine is larger. The stock turbine wheels have a big gap between the turbine and the housing. So they leak exhaust instead of spool the turbo. If you want stock replacement and a better turbo I would buy a S60 with a stage 1 turbine and a .48 housing with an auto trans.
The turbine wheels from the factory are wasted and the oil seal ring rides in the turbine shaft. Don't ever rebuild a turbo without buying a new stage 1 turbine wheel. At the price of a rebuilt turbo with a new turbine, just buy the new Turbonetics turbo. Restoring the car to look stock? Buy new wheels, and center section and turbine housing and wastegate SV. Only reuse the compressor housing, it'll have to be made but will be new.
Soke all of your IC lines and the IC in super clean and get all the crud out. Better yet take off the IC and take it to a rad shop and have it cleaned right. My IC on my CSX is plugged and is a mess.
Remember that if you have an old turbo thats rebuilt, that wasn't getting hardly any oil first time around is sloppy. Then you add the nice oil lines to save the new rebuild with lots of oil flow. Oops the thing leaks like crazy
It is easy to rebuild a turbo, but most are junk because the factory oil lines clog. New SS lines and a new turbo and no more leaks and the turbo may just out live the old Dodge.
TurboDodge.com 
