73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Performance => Exhaust => Topic started by: Dr_Snooz on June 20, 2024, 09:07:47 am
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My entire exhaust system needs replacing. I have to pass CA smog when it's over, so yeah. I want to use these smog legal headers:
https://www.summitracing.com/parts/jba-1830s-4js (https://www.summitracing.com/parts/jba-1830s-4js)
This cat:
https://www.summitracing.com/parts/mpe-339109/make/chevrolet/model/v2500-suburban/year/1989 (https://www.summitracing.com/parts/mpe-339109/make/chevrolet/model/v2500-suburban/year/1989)
This muffler:
https://www.magnaflow.com/products/11229-magnaflow-4-x-9in-oval-straight-through-performance-exhaust-muffler-11229 (https://www.magnaflow.com/products/11229-magnaflow-4-x-9in-oval-straight-through-performance-exhaust-muffler-11229)
Stock routing, 2.5" -> 3", unless I can think of something better.
I'll also put in some V-band clamps to let me remove the Y-pipe for transmission work.
All advice is appreciated.
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Do you not have the SMOG pump?
Sounds like you will either be doing some welding and fabrication, or you will be taking it to a custom exhaust shop.
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No smog pump. My nephew welds, so I'll be buying him something lovely and making with the nice nice.
;D
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If you have the money I would get stainless piping if you have a welder for that.. and definitely use V-bands for disassembly.
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So your truck did not come with air injection? What year is it?
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When I first bought my truck (1981 K10 - Colorado Truck) it had a smog pump. Long removed!
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It's an '89.
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Generally, in California, you must maintain the original exhaust pipe diameter and quantity. Cats must be specific by application per the pertaining CARB EO.
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Do you think there's a tech who will measure my exhaust diameter?
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They did on my 87 R10 w/TBI. I suffered weeks long protracted arguments and had to produce a small book of documentation to "prove" that my truck was actually manufactured with a 3" exhaust, before the local CARB office issued an "exception." All because the state's reference manual indicated the exhaust on my truck should be 2.5". I won that argument but it was a trying PITA. In other words, the risk is yours. But that was years ago and times change. Based on the direction California has chosen, it is probably worse, now.
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Mike, nice to be free of your air pump!
Dr, if your rig came with one, per bd et al the CARB zantis will be looking for it!
Jus sayin... 8)
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They did on my 87 R10 w/TBI.
I kinda feel like there's more to this story, lol. Anyway, my install is legit. Everything is stock. Everything has an EO number on it. My shop knows that everything I bring them is legit. It may look shabby. It may have quarter million miles, but it always blows clean.