Originally Posted by Godspeed!

So there are no California EO legal turbo kits from COBB.

Originally Posted by diambo4life

Back in the day (I am from an era where we played with stock turbos in a different platform 4G63 DSMs) a common cheap mod was to modify the turbine wheels by "clipping" to improve flow. Most often folks focus too much on the compressor side when it's really the exhaust side (especially on smaller turbos and relatively big displacement engines) that would benefit the most. Bigger/efficient turbine wheel and turbine housings (bigger A/R) to a point. You don't want to make it too big and introduce unnecessary lag and not benefit from the compressor side. I wish the EB community did more of this old school stuff. Slapping on $2000 turbos that are barely better than stock is a rather inefficient use of $. Someone could offer a service to port the exhaust manifolds or produce better flowing stock appearing ones (similar to what Forced Performance did for DSMs) and modify the stock turbos as stated earlier for half the cost.

Originally Posted by biz77

ZFG is another tuner,… offers a California EO number. You can find out more here: https://www.tunedbyzfgracing.com/pro...tage-1-package

Originally Posted by SSSam311

Yes... tis what Im saying. I happen to have a friend that does that type of work. Has his own CNC to make various wheel profiles and a high speed balancing rig.
His work is so precise that he wanted me to send him a "stage 5" build from some hack I had on a shelf. He took it apart and laughed.
It was no wonder this turbo guru was getting alot of internet flack when his compressor wheels were flying off the unbalanced shaft into car windows at 100,000 rpms...lol