Need advice - new exhaust

[Dr_Snooz]

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

This cat:

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

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.

[ehjorten]

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.

[Dr_Snooz]

No smog pump. My nephew welds, so I'll be buying him something lovely and making with the nice nice.

 

[Captkaos]

If you have the money I would get stainless piping if you have a welder for that..  and definitely use V-bands for disassembly.

[JohnnyPopper]

So your truck did not come with air injection? What year is it?

[Mike81K10]

When I first bought my truck (1981 K10 - Colorado Truck) it had a smog pump. Long removed!

[Dr_Snooz]

It's an '89.

[bd]

Generally, in California, you must maintain the original exhaust pipe diameter and quantity.  Cats must be specific by application per the pertaining CARB EO.

[Dr_Snooz]

Do you think there's a tech who will measure my exhaust diameter?

[bd]

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.

[JohnnyPopper]

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...

[Dr_Snooz]

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.