What mufflers Are you using? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**LockDoc** · 12-20-2018, 11:44 PM

Quote:

Originally Posted by MySons68C20

Excuse my ignorance......what is a J pipe?

Short pipes that are shaped like a "J". They weld into the exhaust pipes behind the muffler. They have to be a certain length depending on what RPM the drone occurs. If you type J pipe exhaust into Google it will explain them.

LockDoc

**MySons68C20** · 12-21-2018, 01:52 AM

Wow, I had no idea.....I'm 56 years old and have never heard of that!
I didn't google it but does the tone change much?
Thanks Locdoc!

Blake

**LockDoc** · 12-21-2018, 01:31 PM

Quote:

Originally Posted by MySons68C20

Wow, I had no idea.....I'm 56 years old and have never heard of that!
I didn't google it but does the tone change much?
Thanks Locdoc!

Blake

The guy at the muffler shop I go to had never heard of them either. He couldn't believe what a difference they made in the exhaust sound after he got them installed..... Exhaust still sounds good just no drone at highway speeds.

Here is a chart to calculate the length you need.

You can't just make them any length and expect them to work. That's why I recommend doing some reading on them. I think mine are 23.5 inches long.

LockDoc

**MySons68C20** · 12-21-2018, 03:03 PM

Quote:

Originally Posted by LockDoc

The guy at the muffler shop I go to had never heard of them either. He couldn't believe what a difference they made in the exhaust sound after he got them installed..... Exhaust still sounds good just no drone at highway speeds.

Here is a chart to calculate the length you need.

You can't just make them any length and expect them to work. That's why I recommend doing some reading on them. I think mine are 23.5 inches long.

LockDoc

If I'm reading the chart correctly your drone was at 2150 rpm?

**LockDoc** · 12-21-2018, 04:23 PM

Quote:

Originally Posted by MySons68C20

If I'm reading the chart correctly your drone was at 2150 rpm?

Right in that area, yes. @65mph

LockDoc

Andy4639 · 12-21-2018, 10:03 PM

I'm running Chip Foose Magnaflows on my 71 with dual exhaust all the way to the rear corners. I'm running Stainless Works full Length headers from
https://stainlessworks.net/

Aluminum 2.5" tubes.
They are nice for normal driving but when you get on it they will talk to you!

12-21-2018, 01:52 AM	#2
MySons68C20 Senior Member Join Date: Sep 2014 Location: Wenatchee, Wa Posts: 983	Re: What mufflers Are you using? Wow, I had no idea.....I'm 56 years old and have never heard of that! I didn't google it but does the tone change much? Thanks Locdoc! Blake

12-21-2018, 10:03 PM	#6
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: What mufflers Are you using? I'm running Chip Foose Magnaflows on my 71 with dual exhaust all the way to the rear corners. I'm running Stainless Works full Length headers from https://stainlessworks.net/ Aluminum 2.5" tubes. They are nice for normal driving but when you get on it they will talk to you! Attached Images __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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