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#1 |
Account Suspended
Join Date: Jan 2000
Location: Woodstock, IL
Posts: 7,020
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Well, here is the low down. I have my 86 GMC. It has a 305, and headers. Also, my truck used to be a 4.3L. Well, I bought 2 universal cats, and 2 turbo mufflers. Should be cool, right? WRONG.
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#2 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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I feel your pain. I tried my best to get someone to let me run true dual exhaust, but as you have said, it must be the way it came from the factory, i.e. with a y-pipe and single cat. After the cat, I can do anything I want. They are real strict in my state/county and go by the book to the letter. Reason is because of the money they make off this stuff. It's 30 bucks now for a inspection and I think the state gets around 10 of it.
I can't tell you what to do because I'm not sure what is involved for you to pass and if you can get it done without much trouble. But, I played by the rules. Didn't have much choice, unless I wanted to change exhaust every year it came time for inspections. I run Edelbrock TES headers, which have a y-pipe and the A.I.R. tubes. I run these into a single Random Technology 3" in/out cat. Every bit of emissions stuff on my truck works and is hooked up. My truck is far from stock, and passes the tests with flying colors. I know some will chime in and say register it in another county where it will pass. This is not for me though. Besides, the counties around mine are going to emission tests in a year of so. I know this isn't much help, but I don't have anything to tell you but do what you feel is best and less trouble. If it were me, I'd go with a y-pipe and single cat and not worry about it. Believe me, it can be made to look good and flow good this way. As far as the engine swapping, from what I understand, it's legal to swap engines as long as the engine you are installing was an option in the truck. But, as my state does, they use your VIN to go by. So, the tests will need to pass what's legal for the old engine. Not a big deal, since they are fairly easy to pass, if the emissions stuff works. Personally, I don't think the inspectors really care what engine is in it, as long as it looks legal.
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Mike 1985 Chevy C-10 |
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#3 |
Who's in CHARGE??????????
Join Date: Nov 2002
Location: Cahokia, IL
Posts: 455
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1st thing is you "NEVER EVER" tell them you have a V8 in the truck cause they really dont want to know this as long as it passes. The exhaust I would question only because I have several friends who live here in ILL. also & they have duals on their trucks & they all have passed the test. what I would do is this, rather thank buy a dual exhaust if your worried about it, buy a CATBACK system that has a 3"exhaust ran through it w/headers & it will be emissions LEGAL & if you still worried about not passing just pull your PCV out of you valve cover & let it suck in some extra clean air & IT WILL PASS then, hope this helps...joe
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#4 |
Registered User
Join Date: Jan 2002
Location: Houston, TX
Posts: 2,144
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i would get a dual in/dual out cat. that way your really only using one cat but its still pretty much dual exhaust you can take it to you two seperate mufflers after the cat.
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#5 |
You get what you pay for
![]() Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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I doubt a dual in/dual out would be any better than a single 3" in/out. Besides, they probably won't let him do this anyway. If his state is like mine, they clearly say, it must be like it was from the factory. I'm afraid none of our trucks came with a dual in/out cat.
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#6 |
Account Suspended
Join Date: Jan 2000
Location: Woodstock, IL
Posts: 7,020
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The only trucks that came factory with a dual exhaust is deisels.
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#7 |
Senior Member
![]() Join Date: Mar 2000
Location: Rockville,In. USA
Posts: 3,720
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Swervin's steering you right, snatch a set of headers with Y pipe, 1- 3" hi-flo cat, and single 3" to muffler with dual outlets. We run this exact set-up on our 1988 GMC with a Eldelbrock multi-port injection system and it lays us back in the seat nicely on acceleration, while maintaining a nice quite cab interior but with a real *****in sound out the rear.
GMCPaul |
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#8 |
Account Suspended
Join Date: Jan 2000
Location: Woodstock, IL
Posts: 7,020
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Hhhmmm... Well, I really don't need the 3" stuff. It's a tired 22 year old 305.
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#9 | |
Registered User
Join Date: Oct 2002
Location: Iowa
Posts: 71
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#10 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Sometimes I just don't get the government. Case in point: My 78 elcamino w/tired 305. All original, all correct emission equipment. I added a single hi-flow cat & dual flowmaster exhaust because that's what was 'technically' correct. Fast forward: New 350, crane cam w/L-82 specs, 4-barrel holley emissions carb for L-82 vette, performer intake, + headers. I wanted to run a true dual exhaust w/cats (so I wouldn't be disabling the emission aspect)but it's technically illegal because of 2 cats. I decided that since 2 cats are illegal (it's not any more illegal than none at all & none at all is cheaper), I left them off & pieced together a 2.5" system. Comparing both emissions analysis from one year to the next, WITHOUT cats & with a 4-barrel & performance cam it RAN CLEANER than the stock 305 w/all correct equipment. Just like you, I want cleaner air but technically my combo was illegal even though it burned cleaner. I say stick the probe in the tailpipe to check for a clean burning engine & leave the hood shut. Just so you know, I wouldn't have driven it if it wasn't equal to or better than what was legally required. My 2 cents.
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#11 |
Account Suspended
Join Date: Jan 2000
Location: Woodstock, IL
Posts: 7,020
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Well, I already have all the parts to do the job. So going to a 3" is not really an option. Also, yes, $275 included everything. But... I only paid $500 for the truck, and is by no means something I'm gonna keep forever. I really want a 4x4, and I can't get that $275 back out of the truck, come time to sell it. I dunno what to do.
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#12 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Jason...FED law says you can have a larger engine in there, as long as it was an angine available in that vehicle make/model when new. We all know a 305 was available in these trucks so it should be ok onless your local gov has added to the laws like Cali does.
While true, your pipes are not legal, I'd imagine once you fix them, you should be ok as long as the engine passes for 305 standards. |
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#13 |
Account Suspended
Join Date: Jan 2000
Location: Woodstock, IL
Posts: 7,020
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Nah Andy, when I brought in my 69 for testing, I told the guy it had a V8, and he told me it was illegal! If it was a 6 cly, it has to be still a 6 cly, not a 8. I'm thinking of just getting the pipes done, I am tired of the exhaust dumping under my seat.
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