my vehicle(1987 Dodge Truck) is exempt from emissions in my state (MO). Could I remove my cat converter and erg? Would this make my slant 6 run better? or worse?

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I pulled the cat from my 83 and noticed a difference (for the better)

I yanked the smog crap off my '71 Dart, but still have it all in a box in the garage. Never know when some zealot congressman might go on a crusade and move the target again...

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obliquely-inclined state of mind

So long as you have verified that your truck is exempt from emissions inspections, you will most likely notice a significant improvement in performance by removing the catalytic converter and disabling your EGR valve. You should also make the effort to replace the lean-burn/spark control/computer controlled ignition and carb with a standard carb and standard electronic ignition (HEI is an easy and good swap).

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Casually looking for a Clifford hyperpak intake for cheap.

This is the single most important piece of info! It will make a world of difference, then you can fiddle with the advance curve and you won't believe the difference.

sb

*laughs* this remindes me of when i went to have the exhaust hung on my car. the guy put it on the lift and took one look and said "we cant do this it has a cat" "oh" i said he told me "yea some of these did and some didnt you should probably go wait in the waiting area" i walk in the waiting room and hear a sawzall fire up and a crash of "something" hitting the floor. apperently my car was not equipped *whistles *

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1975 Plymouth Duster,225/6 2bbl. and duels, 904, 7 1/4
1986 Dodge Charger Shelby, 2.2 Turbo I, A525

Mine "gutted" itself. I changed the muffler in January '06. I took a piece of rebar to drive in there and bust it up.


IT WAS EMPTY!!!

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

I did a lot of work long ago with a '75 /6 to test the converter and EGR (no OSAC) and eventually decided that they didn't hurt mileage as far as I could see if they worked OK. I tapped into the backpressure at the EGR port, and the backpressure was fairly low except at WOT which ran ~5psi... I didn't do a w/o cat comparison.

Temporally disabling EGR during WOT helped power greatly - the vac amplifier was supposed to do that, but I never got it to do that quite right. With good fuel I found I could bump the timing up a few degrees too, and that seemed to help some too.

I'm 99% certain that removing or disabling factory emission controls w/o a special waiver is a violation of federal law. I've only seen the waiver on 1 cop car.

Here in VA, the yearly state inspection requires that they all be present, but (at least in my area) don't actually have to work. I telephoned the head of the VA state inspection program and was told that non-identical replacement parts the functioned are illegal, while non-functional original style parts are legal. even if the original style are N/A and you've got a letter from Chrysler saying to substitute the newer part.

That said, in living here nearly 20 years, I've only once had a hassle due to questions about emission parts at a state inspection.

does the car still have to have like a safety inspection? IN N Carolina, older cars still are inspected, and all that stuff has to be on there. THey just dont get hooked up to the OBDII machine.

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What's that fuzzy blue thing being hurled this way?
::stick::
BOOSH!!!

Since I never owned anything newer than '83 (my new car) older is a relative term for me. In NC if a vehicle exceeds 35 years in age, no inspection is needed. I have had to carry the statute to show the cops when in my '64. Sounds counter to common sense...35 years old and smoking like it's burning pine knots...no inspection. Even motor vehicle clerks who sell the new annual license plate sticker are confused about the applicable rule. Good for us "old" car guys. I do keep a wary eye on our legislature here in NC who periodically want to ban "antique" cars on the road.

rock
'64d100

There are many. I had one. Anybody who was stationed in Germany during the Cold War years could get one if they asked. Back then all they had was leaded gasoline in Europe so I got one to remove my cat and the gas nozzle. That alone added a lot of driveability and horsepower.

So, there are a few floating around. As for the legality of removing emission controls, at least around here no one cares.

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If it was easy, everybody would be doing it.

Hey rock; what about the 90s-even early Y2K cars with blown head gaskets and such, that run down the road like mosquito foggers???? Definitely not antique and definitely as big, or bigger problem than "antique" cars.