Tbi 350 exhaust.

[95burban]

I like them to look like GM could have built them that way. Hence an 8.1L GMT800 2500/3500HD replacement muffler and tail pipe.

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That’s rad! I might steal your idea on my next build. It will be to low to run a tailpipe but I will run turn downs on that big muffler.

 

[Nad_Yvalhosert]

I looked into the dual front pipe from a Vortec as an upgrade to my '95 TBI truck. It would probably fit, but my truck had a single O2 located in the Y, just in front of the converter inlet.
While I could block off the other 3 bungs and put the sensor into one, it would limit the collection of gasses to one bank, like the earlier models. I kinda like the factory location sampling both at the Y. (I upgraded to a 3-wire heated O2 sensor)

Instead I bought a mandrel bent 3" and shorty headers. Then a 3" Magnaflow for sound control. A single 3" pipe lowers the exhaust tone, and it has more volume than the dual 1.75 diameter pipes without sacrificing exhaust velocity.

 

[Jerrys1990]

That makes sense. The emissions testing stations are too lazy to crawl under the truck so they can stick the sniffer in the pipe for OBDI vehicles


Here in Maricopa County AZ I'm running a 3" Borla Pro XS straight through muffler. It didn't bother them the last time, before I got the "Historic Venicle" plate and "Collector Car" insurance. Now I'm exempt

Sorry to dig up an old post....how does that 3" Pro-Xs sound? Any video? Looking at one for my '90....3 inch single exhaust all the way back. Wondering how loud it is since it's only offered in a 14" case.

 

[pressureangle]

I have a Walker Class 7 commercial muffler. Makes it sound like a dump truck.

 

[Das Hatt]

This YouTube channel is dedicated to showing the sounds of exhaust on various vehicles. Most of it isn't related to Gmt400, but there are a couple of videos that are.

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[PlayingWithTBI]

Mine is pretty loud but, since I put in the 383 with the single 3” Cat straight into the Pro XS it’s a little quieter with less drone, ha ha

 

[thatguyHoBo]

The Y-Pipe (Part Number "JBA-2831 SY" from Summit) worked fine on my Summit Racing (made by Trick Flow) shorty headers. Don't believe everything they say

Did you use the springs on the flange bolts or just bolt/washer/nut?