gavonder

Jay777, I sent you a PM.

Bill Verburg

it's not so much the hp as the raised torque curve in the mid range, that's what you will feel and use on the street. On track at wot the difference is small.

all 2wd US cars use the same g50/20, w/ the same gearing, only the RoW g50/21 had 2 different 3rd gears. The g50/21 is overall better geared in either form than a /20. The difference that can be meaningful to some is the design of 1 & 2, early /20 have a fixed 1 but separate 2-6, later /20 have fixed 1 & 2 w/ removable 3-6. There are also some relatively minor 3-4 guide sleeve and needle cage updates done at the same time
the cut off for separate 2nd and updates is is
G50.20 - 02693
G50.20 - 02174 (M220 lsd)

The biggest differenc in US 993 from '95 is the OBD version

thru '95 OBD1 is used w/ a 55 pin brain & harness, single O sensor and generally more benign maintenance needs, the DME has a user replaceable chip if that's important to you.
from '96 on OBD2 is used, '96 was a 1 year only non flashable unit, it cannot be updated only replaced. '97 & '98 have DMEs that can be flashed by a shop w/ the right skills and tools. A
All OBD2 have a slightly different exhaust design w/ 4 O sensors, OBD2 is much more sensitive to engine modification and wear issues.

Any of them can have modified mufflers and Motorsound air filter cover installed, OBD1 cars can remove the cat w/o issue, OBD2 not so much

Spokes

Correct Bill. Mine is NZ, Vari-ram, 96, OBD1.

heliflyer

Just to throw something in the mix:
I have a UK car - first registered 15 Dec 1995 that is fitted with a variorum engine (engine No 63T02668) so it seems some 1995 cars were also fitted with a variorum engine.

orangecurry

You are mixing up the calendar year with the build year.

Porsche build years went from Sept-Sept.

Yours will be an MY96, as designated by the T in the VIN