1997 K2500 454 Rough Idle, Loud Afterfire

[Mangonesailor]

What's the difference between the Walker and Magnaflow brands, why is Magnaflow $100 more?

Walker is typically a "stock replacement" level brand, while Magna flow is a "performance brand." Either the Magnaflow replacements he's linked to are performance based or you're just paying for the name.

 

[Schurkey]

What's the difference between the Walker and Magnaflow brands, why is Magnaflow $100 more?

Look at the photos. Magnaflow seems to be mandrel-bent, Walker is OEM crush-bent.

And it asks me for cat placement, why does it have 6 options (driver, pass., left, right, front, rear)? Mine are under the passenger side, but why does it only 'fit' if I select Rear?

Wild Guess: Summit screwed the pooch on the description.

 

[Supercharged111]

Don't get the stock replacement Walker muffler. It's restrictive garbage. I used a Walker bus muffler dual 2 3/4" in, single 4" out with a 4 "mandrel bent Diamond Eye tailpipe and kept stock cats. It sounds like what a stock muffler should.

 

[Schurkey]

I used a Walker bus muffler dual 2 3/4" in, single 4" out with a 4 "mandrel bent Diamond Eye tailpipe

Part numbers?

 

[Supercharged111]

Muffler is 22231

https://www.summitracing.com/parts/wlk-22231/

Tailpipe had 2 or 3 sections that I welded together.

https://www.summitracing.com/search...artment/exhaust/make/gmc/engine-size/6-5l-395

I used 1/2" thick hangers from Amazon that I welded on.