bigdaddymac

This is my plan as well. From what I found it is 3" off the Y then I found mixed info on the rest until the 3" off the stock muffler. Probably end up crawling under the truck myself to confirm.

Summers22

iTrader: (2)

Thanks and I will have to measure it all myself, the 2017 has a smaller casing on the resonator than 2015/2016.

Apples

The collector flange at the Y is 3", but the immediate downstream tubing is 2-1/2" all the way through the factory 2-1/2" resonator, then the factory 2-1/2" oval muffler the exit of which has 3" factory mandrel-bent tubing.

I first swapped only the rear muffler for a 3" Series 70, then early last week finally replaced the 2-1/2" from the Y-collector with 3" *and* a larger, 3" resonator. If I do anything else, it would be to 180* the orientation of the resonator back to the factory location just off the Y... but I doubt I will.

The PCM only needed a couple of engine hours to respond *most favorably* to the airflow changes. Thing runs harder now and sounds better if a little bit quieter (with the longer resonator).

Husker

iTrader: (4)

That's what I thought. I want the pipe routed up and over the axle but there's too much in the way. Going under the axle and across looks like crap plus the spare tire is in the way.

ZeroTX

To be honest, and this would require some research, but I think you can get the most low tone on a smaller engine using a chambered Flowmaster. Probably like a 3 chamber. Won't be super loud, but will have a nice low tone, especially at idle. Cannot do much about the higher pitch at high rpm.

Apples

Which is why I stayed with a single exhaust. It's less expensive, too. More money for gas. And while I'm old enough to appreciate a true, dual exhaust setup (make mine with an X-pipe crossover, pls), an engine doesn't know how many pipes it's breathing through. It only knows if it has enough tubing cross-section for the least-restricted airflow, while maintaining exhaust gas velocity. Too large a pipe and velocity is diminished. One 3" tube flows as much exhaust as two 2-1/2" tubes, believe it or not!

johnday in BFE

iTrader: (1)

Ya, that would be something to look at. I'm planning on Borla actually. I had a flowmaster chambered before, and the drone wasn't as bad as a Roush, but it still had drone. I'll do more looking at that since I'm putting it on a totally different engine, it could be a big difference.

ZeroTX

Well, the same thing that makes the ""drone"" is what makes the deep sound. The drone *is* the deep sound haha. I have run Flowmaster 40's on two vehicles and of course there is "drone," because that's what Flowmasters sound like. It takes a tractor-like-sounding V8 and makes it into a deep smooth tone... If you want a beautiful, loud, deep sound while accelerating and no sound while cruising, then you need a magic wand, not an exhaust

techieanalyst

Actually may go with Bora ATAK, just need to verify if it can go on an 18

ZeroTX

Also, can just weld in a 50-series Delta Flow on the stock system. Retain stock resonator. If you don't like the sound, sell the 50-series to someone and install the complete Borla setup (IMO, the Borla will sound "tinny" so that's probably not a good fit for a V6.... what about Magnaflow?).