Cross flow muffler?

[Huen79H/O]

I had a dual inlet and dual outlet installed on mine made by thrush cost about 130 installed tech said it was for a firebird

 

[pagrunt]

The passenger side is the same one used on the single set up, the drivers side (if I'm remembering right) ties into the muffler hanger on that side.

 

[TURNA]

Diesel Cutlass had dual exhaust exhaust exits


O'reillys still sells the muffler Walker part number 42565
https://www.oreillyauto.com/detail/...e0/walker-quiet-flow-ss-muffler/22143/4791380

ID Carid had the intermediate pipe convertor to muffler
https://www.carid.com/walker/intermediate-pipe-mpn-48254.html


The Wrench Monkey in Canada has the tail pipes walker 42565
https://www.thewrenchmonkey.ca/products/auto-parts/walker/42565/

and
Walker 43756
https://www.thewrenchmonkey.ca/products/auto-parts/walker/43756/

 

[DoubleV]

Many of these places advertise they have these exhaust parts but they don't. Ask me how I know....😞

 

[airboatgreg]

I went to a local muffler shop and they hooked me up. Awesome sound

 

[DoubleV]

A bit vague don't you think? Hooked you up with what? How was it installed? How does it fit? What size exhaust?

 

[olds307 and 403]

You pretty much ignore The Wrench Monkey, they also said they had Permadry valve cover gaskets for the Olds V8. Unfortunately DoubleV, some fabbing will need to be done hook up anything but the stock set up, which is garbage from front to back for any performance, it even chokes the 260. I pulled off my shorty headers and 2.5" custom duals with a compact X pipe because I thought it was a waste on a stock 260. I then went to less than 2" dual exhaust, pulled it off my 70S. Off the line is almost the same, with the headers and 2.5" x pipe system, slightly stronger but 3000 RPM up it, pulls like a healthy 5A head 307, the 260 sounds like it is beating itself to death with the small dual exhaust past 3000 rpm. Remember, my 260 is a sludged up, unknown mileage motor with a lifter tick. Your car is a cream puff with low miles. I would carefully remove all the stock exhaust and store it. Take it to a shop you trust, buy the block off cap, it fit my 260 manifold, was on my 70 when I bought it and get them to bend dual exhaust in whatever size you want with whatever mufflers you want, all going under the passenger hump, my shop fit 2.5" pipe with a compact X pipe. Your car is rare but not highly valuable, why hold back on making it perform and sound better? Even the factory 442 set up barely helped performance. While I am stripping the paint off my 88 this winter, it is getting the headers and 2.5" x pipe exhaust put back on, so I can forget it has a 260, sounds amazing by the way and hopefully help it get closer to my 30 mpg goal.

 

[Jeff Blagden]

The cross flow Muffler I put on my 1980 442 with a 350 engine was a Magna flow the model number was 12388 2.5 inch pipes fit was great but welded on brackets to fit the factory locations for the clamps I did not do it myself had a shop do it they ran it back from the cat and just put stainless tail pipes on hope this helps I am at work but after I could send pictures have a good day

 

[olds307 and 403]

Didn't the 80 442 have a dual exhaust from the cat back or is that internet BS?

 

[Jeff Blagden]

Internet B.S a single from the cat a cross flow muffler to a dual outlet 7o give the appearance of duel exhaust my 75 firebird with a 400 engine had the same thing