J Pipe Resonator

[bayouguy71]

I have decided after much reading that I am going to try a j pipe on my exhaust before my next road trip with the camper.

Flowmaster FX catback, sounds great except for a drone under load in the 1800-2000 range.

I have a shop that is going to look at it with me on Wednesday.

 

When doing the calculation I get basically 28-25 inches respectively.

 

My question is do you build for the longer length and it covers the whole range?

[lucas287]

I did a TON of research on this years ago fighting drone on my Mustang. Then again with my dad's SRT8 Charger. 

 

What we found was its best to make it adjustable because what works in theory plays out different in reality. Also, we found it most effective when the j pipe was the same diameter as the main pipe. 

 

One more thing, make it tee off 90 degrees for a good amount before turning it. 

 

Good luck! You likely find that it makes it overall quieter and cleaner sounding. It did in both cases for me. Lost that snarl and rasp. Not always a bad thing. 

[bayouguy71]

Thanks, not really sure how to make it adjustable easily.

I could always make it 30 and cover a broader RPM range I suppuse.

 

Funny enough I took off the huge tip that came with this system and it actually helped so I have to believe that anything will help at this point.

 

 

[rlcole321]

If you are doing this for a performance enhancement, then the Flowmaster muffler is not the best choice, you want a "Pass Thru" open muffler for better Bang for your buck, but if you are only looking for the "Sound" then your good!

[bayouguy71]

Flowmaster FX is a pass through muffler.

I am not doing this for performance (the exhaust is already done)

 

I am trying to eliminate the drone on the installed Flowmaster FX cat back

 

[lucas287]

On 5/1/2021 at 5:18 PM, bayouguy71 said:

Thanks, not really sure how to make it adjustable easily.

I could always make it 30 and cover a broader RPM range I suppuse.

 

Funny enough I took off the huge tip that came with this system and it actually helped so I have to believe that anything will help at this point.

 

 

 

Sorry for not responding! Check out the way Solo does it,...

 

[bayouguy71]

could do that I suppose and just clamp it into position right?

 

[lucas287]

47 minutes ago, bayouguy71 said:

could do that I suppose and just clamp it into position right?

 

Yep! A lap joint clamp should work like this:

 

[bayouguy71]

I am going to do this out of 409 SS just like the rest of my exhaust (gotta love the rust belt) 

Will SS stretch like that to make the slip joint?

 

[bayouguy71]

Having this done next Friday and hopefully making it adjustable.

Exhaust shop had never seen this but understood what I wanted done.

Will get some pics and let you know how it sounds

 

[pokismoki]

curious to see results, i feel i know how it will turn out but post some clips

[lucas287]

On 5/4/2021 at 3:37 PM, bayouguy71 said:

I am going to do this out of 409 SS just like the rest of my exhaust (gotta love the rust belt) 

Will SS stretch like that to make the slip joint?

 

I think solo exhaust kits are SS and 409 is a low grade of SS, so it should be fine? 

[bayouguy71]

Got this done Friday and am very pleased with the results.

I didn't get pics but you guys know what they look like

He did make it adjustable, it will go from about 25 to about 29.

It is set at max right now and sounds so much better.

The test will come up in a couple weeks with the camper.

[BigBlueLB756]

CONGRATS!!!!!!

[Byrds8]

I have the Solo exhaust on my truck. Its pretty mellow even with their loudest version. I removed the extendable portion of the J-pipe just to get a bit more db out of it. No drone. at all. Glad you got yours worked out. Drone sure can give a headache.