I want a T04 Turbo, just don't know which one to get? R, E, S, X? What tha crap?!?!?! I want a daily, street-drivable FD with low lag. Which ones are twin entry (tang?)?? Does that help? Please explain!

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'93 Montego Blue
Pettit Intake
PFS Midpipe
PFS Cat-back
PFS boost guage
Pettit Pulleys
RP Aluminum Radiator
Knightsport bumper
Turbo Inside sticker (worth 10 hp!)
Bonez clutch and lightweight flywheel

Coming Soon: GReddy 2-row FMIC, APEXi AVC-R Boost controller, APEXi Power FC

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The only TO4's listed at the Turbonetics site are TO4B, TO4B Super and TO4E. They do list different compressor wheels (S-3, T-5, V-1, H-3), (Super S”, “Super V”, “Super H”) and different compressor housings such as the Hi-Fi.

I don't know where all those other letters you asked about come from. Maybe the company selling them named them that way after making some modifications.

The turbine housing can be a "Tang" and be divided or undivided. My understanding is that the divided is better but, needs to be mated with a divided manifold to get the benefit. The divided manifold is about $550 versus about $300 for an undivided.

I have a T-66 with undivided .96 a/r p-trim turbine housing. I'm very happy with it but, it does have lag when driving normally on the street.

Lots of people here seem to be very happy with their T-78 setup but, that's about the same size as my T-66 and probably has some lag. I think you should look into maybe a TO4E "60" or smaller to reduce lag.

Mike