Cool exhaust systems on a /6

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FURY440

FURY440

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Like to go with a new exhaust system for my 66 /6 Signet. What exhaust are you running on your /6 that sounds good. Parts you ran and cost if you remember. Also, anyone running no muffler? Pictures please if you have them or video of how it sounds/looks.
 
years ago, I had headers, and 4bbl on a 225. I had dual 2-1/2" pipes, w/turbo mufflers. It sounded a little like a (don't laugh, this is for real) Jag XKE.
 
So, am I to understand that you want an exhaust system that only "sounds cool" and couldn't care less about being correct for performance?

Then run a header with a header muffler bolted directly to the header collector with no other exhaust. It will sound good.
 
Its impossible to beat the sound AND performance of a big diameter single on one of those things.
Go 2.75 inches off the collector and through a Flow master.
 
What I mean is something that sounds good and has performance also without breaking the bank. I don't want to run a header. It has a stock exhaust system on it now. 1 7/8" front pipe and 1 3/4" tail pipe. Stock engine,.with stock 2 bbl carb, stock exhaust and intake manifolds.
 
Find a Super Six head pipe, and use that to get your system pointing in the right direction, then step up from there.
When I have those, I sell them for $25. Throw a want add up, I'm sure somebody on this site has one.
 
rustycowll69 said:
years ago, I had headers, and 4bbl on a 225. I had dual 2-1/2" pipes, w/turbo mufflers. It sounded a little like a (don't laugh, this is for real) Jag XKE.
Click to expand...

From the 1967 Complete Book of Engines.....Engine modification for high performance.....

Exhaust Pipes-01.jpg
 
FURY440 said:
What I mean is something that sounds good and has performance also without breaking the bank. I don't want to run a header. It has a stock exhaust system on it now. 1 7/8" front pipe and 1 3/4" tail pipe. Stock engine,.with stock 2 bbl carb, stock exhaust and intake manifolds.
Click to expand...

Pretty simple...Get yourself a 2.25" exhaust off your stock exhaust manifold (I like the super six head pipe idea) to your favorite free flowing muffler. Do a turn down right off the muffler, or take it all the way to the back. Go up 2 jet sizes on the 1920 Holley, and your on your way.
 
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well. years ago, it was no big deal to find headers for a slant, or for that matter find turbo mufflers. They got the name "turbo" because they were designed to fit on oem turbo charged corvairs. I just made up my own dual 2-1/2" pipes with straight lengths and a couple of u-bends. There's no reason anyone couldn't do the same thing, today. I've never even seen pictures of the cast-iron hyper pak headers, though I have seen the cast iron big block headers, availabe on early 60''s 300's.
 
rustycowll69 said:
I've never even seen pictures of the cast-iron hyper pak headers, though I have seen the cast iron big block headers, availabe on early 60''s 300's.
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Here they are in pics - HyperPak Headers
hyperpak headers.jpg

In a car
hyperpak intake and headers.jpg


Dutra duals:
dduals-set.jpg

dutra duals.jpg


Dual Dutra Duals (first pic is coated - would look nice in my '26 Dodge build I'm working up):
dual dutra duels - coated.jpg


dual dutra duals.jpg


Here's info on the Dutra Duals, and how to order them, along with recommendations on exhaust setups:

Doug's SL6 Exhaust
 
wow. those hyper pak exh. manifolds are swoopy, thin and beautiful! Kind of remind me of a 2nd Gen Hemi manifold. Dutra''s are heavier-looking, and shorter. But you have to go with the one that is available, and Dutra's will do.
 
rustycowll69 said:
wow. those hyper pak exh. manifolds are swoopy, thin and beautiful! Kind of remind me of a 2nd Gen Hemi manifold. Dutra''s are heavier-looking, and shorter. But you have to go with the one that is available, and Dutra's will do.
Click to expand...

Oh yeah, pay the Dutra guy more for iron manifolds than any steel tube headers cost. My big old butt.

Listen, you want the perfect exhaust setup for a slant? .....well.....ANY American inline six with a firing order of 153624........here it is.

The inline six is perfect in that you can separate the first three and last three exhaust ports and there is one in each pair of three that fires every time.

So, a set of headers with dual collectors, and a Flowmaster wye tied into the pipes coming off the collectors going into a single 3" exhaust pipe is the best possible exhaust system you can ever run. you will have the serious advantage of one cylinder firing in each collector every time and helping to evacuate the last spent exhaust gasses of the last fire.

It's the best possible exhaust ever and hardly anyone ever does it because they get caught up in wanting gay *** dual exhaust like all the V8 guys......and they aint got a V8.

No way would I ever pay the gold plated Dutra price for short, stubby manifolds, when I could get some great flowing headers like Hooker.......but it's your money.
 
RustyRatRod said:
Oh yeah, pay the Dutra guy more for iron manifolds than any steel tube headers cost. My big old butt.
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Dutra front is $225 - you can mod your own back half, he has directions posted.
Mine Y's into a single exhaust, per what you said.

Hookers are $480, or $750 coated, from Summit (and I think they're '67-'76 only, no love for early As):

https://www.summitracing.com/search...y/mopar-inline-6-cylinder?N=4294924068+400390

Clifford are $399/$429, if they ship them, and there've been reports of warped flanges: Mopar
Works with early A's, but supposedly not with Power Steering (Dutra Duals work with PS in my '64)

There was a guy on slantsix.org that was having someone cast some new Hyperpak headers based on a modification to an original set, but his wife is having health issues, so that's not come to fruition yet. I think he was asking people to chip in something like $650/set to get an initial run cast and machined.

Aussiespeed has headers, too - $575 ($695 for the Early A version) - those may be Australian dollars, in which case they would be about $415 - $500, plus shipping from down under.
 
I wasnt trying to show the man any disrespect. Lord knows he's a slant genius......and genius in other avenues as well.

My point was that you still have a manifold. A SHORT runner manifold. There's no substitute for a long runner header. None. Never has been. Never will be.
 
Thanks for all the responses. I didn't want to go header, but I will look into it. Lord knows anything would be better than a 1 7/8" front pipe and 1 3/4 tail pipe!!
 
Before I went v8 I had a 2.25" system and a Flowmaster, stock manifold. It sounded great to me.
 
L
FURY440 said:
Like to go with a new exhaust system for my 66 /6 Signet. What exhaust are you running on your /6 that sounds good. Parts you ran and cost if you remember. Also, anyone running no muffler? Pictures please if you have them or video of how it sounds/looks.
Click to expand...
Love my dutra duals. Only need to order the front casting and like the fact that I can keep the heat box. For a daily driver it works great!
 
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