Jody, I hate to say it, but rear-mount turbo, or better worded, "post-cat" turbos. You can put anything you want AFTER the cats here in CA, but nothing before. Headers and some hi-flow cats would probably work pretty darn well, just size the exhaust housings to work with the lower temperature and decreased volume of the exhaust at that point in the system. It wouldn't be as efficient as just after the exhaust ports, but I bet it would still work well enough to make more HP than the supercharger.

The only thing I am unsure on would be removing the supercharger, I don't know how that would fly. My guess is that it would NOT pass visual. I suppose you could "hollow" it out by removing the rotors and use it for a plenum box, I bet that would fly!

Another option to consider to get rid of the supercharger-- swap in a later model engine without an SC, that way based on the CARB laws you have to meet the smog requirements (sniffer and visual) of the NEWER engine. That way there is no Supercharger in the loop, and you could still do the post-cat turbos and pass with flying colors if the sniffer checks out OK. That's not a good option though as you have that low mileage built engine in the truck now.

I also hate California's "visual" testing. If it passes at the sniffer, what's the difference what it looks like under the hood? The emissions are what matters! That was the case with my Turbo Trans Am, in my "modded" form it would pass the sniffer (barely) but wouldn't pass visual. The only thing that should be visually inspected is the PCV system (since it's a potential emissions source) but that should be it!

Jody, another option would be to buy a small piece of property up in the foothills where there are no smog test requirements and register the truck there. Several of my friends do that. You'll still be in big trouble though if you get pulled over by a cop or get trapped in a mobile smog test, as they could impound the car on the spot for emissions tampering. Just because the county you live in doesn't have biannual smog test requirements does not mean you can remove/alter the original equipment.

Jody,

There are a few brand new Garrett GT35R's collecting dust upstairs in the Race Shop that would work very well in a twin capacity. They already have the big 1.0 A/R on the turbine side and the .70 on the compressor.

:yes:

Ah crap! :willy: Now my brain is really spinning! :unibrow:

Jody

ok.... all this turbo talk has me wondering how much damage would be done to turbos sitting out in the wind/rain/road debris? i seriously thought about a TT set up on my lil project https://lateral-g.net/forums/showthread.php4?t=1120

but once again this would be way outa my poor white boy budget with out a federal grant or sponsorship

Wind won't effect the turbo other than having superior heat dissipation. A good air filter will ensure road debris doesn't get sucked into the impeller.

The turbine housing operates at fairly high temperatures so if they were to cool off to quickly they would be prone to cracking.

Give me a call if you have any questions.