Sounds like they decided to draw a line at OBD-II, pretty cool. And surprising coming from that liberal-Dem haven. Here in Jaw-ja we have a 25-year rolling exemption, so my car no longer requires them but '84 has one more year. I just had mine tested for the helluvit and passed with flying colors, nope no mods going on here.

 

IMO all street-driven cars should have cats. The horsepower drop for the new metal matrix cats is like 5hp on a 928? I mean, come on.

Dan
'91 928GT S/C 475hp/460lb.ft

 

Heck, all you guys are lucky compared to us in the Republic of Kalifornia. They stopped the rolling date, and are stuck at 1975. So basically, that's it, no waiting a year to get that car you've always wanted to tinker with.

Ugh.. engine swaps here are pretty difficult.

 

Right, you just need to worry if they will mess up your car:
- lifting it to check the front wheel bearings
- jamming it repeatedly into "1st" when it keeps going backwards

I run cats on all of mine and will continue to do so. The exception would be the '89 once it becomes a dedicated track car.

IMO, no-cats is just too damn loud if you have an RMB. It's a lot louder if you have an X-pipe w/o cats. It's NASCAR loud if you've got GT cams with an RMB and a test pipe. I cannot imagine how loud my '91 would be with no cats, x-pipe, RMB and the SC. I'm going to bet it would make ears bleed.

And yes, it still is not legal to 'tamper' with the emissions control systems.

Nevertheless, getting a 928 inspected in Mass now has a much lower stress factor.

 

I am running cats on both and will continue to do so, but have had dual slight NOx issues this year (HC & CO are ok).

I think the 86.5 is simply lean...ARM-1 goes to full rich as it should on full throttle then falls back to stable RED LIGHT, which is where it sits regardless of throttle/idle and hardly ever hunts at all; recent O2 sensor. I believe it's trying to fight a vacuum leak at the throttle body->center intake tube. That and/or there is a fuel pressure problem that goes away momentarily when the f/p damper does its thing when punched, and/or there is a short in the TPS idle switch that is overridden by a working WOT signal (anyone know what LH does if it gets BOTH closed and WOT signals?). Either way, intake removal coming

The ARM-1 behaves as it should on the GT, so not, apparently, lean, but some other issue (maybe needs a new cat, or maybe patching the small cracks in the headers and plugging the open AI bung on the cat helped, but I decided just to wait rather than retest).

 

And the carbon footprint of manufactering the green car is equivelant to driving the catless car 80,000 miles.

 

Right on

It's true, the energy required to generate the small particles used in a these newer technology batteries is rediculous.