This will seem like a really dumb question. I'm fairly new to the site. Where can I get Dutra Exhaust for my 64 vert? What is the cost, and what are the advantages?
Thanks in advance,

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On the Oregon coast, where late at night you can hear everything rust

http://www.dutra.org/doug/doug-sl6-exha ... -duals.htm
Advantages over stock: less restriction, helping efficiency and/or power.
Advantage over headers: more durable, possibly quieter, keeps heat for better cold weather driveability.
Disadvantages: Heavier and more restrictive than headers, more expensive than stock.
Pretty cool in my book!

About $225 I believe for the front, not sure on the rear (you can do it yourself with the screw-in method or welding method if you are able) if doug is selling those or not.

Thanks guys, a good summary of the cast iron dual manifolds I make for the Slant.
I can make-up rear sections for people as needed, send me a PM for more info and pricing.
I have run Dutra Duals on my 66 Dart wagon for 15 years now, I got increased performance without any trouble, not even the cracking problem stock manifolds give you.
DD

I've had Dutra Duals on my Volare for several years now. Even though the two pipes are just going back into one, I still like 'em. If nothing else, I don't have to worry about the exhaust manifold cracking in two.
A worthwhile upgrade, in my opinion.

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"Ja, Ich fahre ein altes auto."
'78 Volare 225
'67 Charger 318

What do you think about using the dd. on the rear, and modified stock in front?
I have two stock manifolds, that has cracked or bent in the rear.
Does it fit ok, and have room for ex.pipe?
I guess it doesnt matter front or rear, but anyway...

You can mount it up that way but starter clearance is tight.
There are many options including "non heat" rear sections.
http://www.dutra.org/pictures/engine/pa ... p-side.jpg

Also, if the manifold is warpped (not cracked) in the rear section, it is possible to re-align it by angle grinding the intake to exhaust manifold mating surface to get proper port alignment, then resurface the port face, as a set to ensure everything is flat.
DD

Doug, have you ever thought about designing and selling an exhaust pipe to go along with your headers?

I've put off installing mine because it's a 10 mile drive to the muffler shop to get a custom pipe built. It sure would be slick to have a bolt-on!

I'm not Doug, but here's a big problem with designing "a" pipe for the Dutra Duals: Every car, with every equipment configuration, is a little different. It would be essentially impossible to design "a" pipe that would fit all the different cars and trucks and vans, with all the different engine bay configurations, with/without A/C, with/without P/S, with different type engine mounts, etc. And then, which kind of pipe would this be? Some people want dual 2", some want dual 2¼", some want 2-into-1, some need to wrap under the oil pan and run rearward on the RH side of the car...!

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"Never miss a good opportunity to keep your mouth shut" Will Rogers.

Assuming you do your homework and choose your mufflers thoughtfully, the sound produced by duals all the way back without a balance tube will put a great big grin on your face each and every time you drive the car. That, in my opinion, is worth the price of admission.

So what exhaust with the dutra duals sounds the toughest? 2 into 1 muffler then back out to duals or duals straight back?

Nope. Duals all the way back, including two individual mufflers, with no crossover.

You would get most torque from 2" primary pipes about 30-32" long into a Flowmaster "Y" with a 2 1/2" outlet , single muffler and 2 1/2' tailpipe. You would need at least a 2 barrel to feed this.

Chev used this in the early 80s on their high output 250 with progressive 2 barrel carb. They used a split manifold , nice equal, tuned length primaries and a largeish tail pipe. On the 250 the combination was worth about 15-20 HP over a comparable single exhaust 1 barrel. I used one in a 3/4 ton Suburban for 3 years,,,,a real screamer.

I use tuned primary pipes to Flowmaster Y on all my fleet vehicles for max torque and fuel economy. Primary length depends on cam used and where the torque is desired in the RPM band. Cams used vary from 206(Comp 252) to 226 duration . Primary lengths and pipes sizes vary accordingly.

If you want raw Decibels,,,,Dan has the answer. Mebbe headers and no mufflers could improve this.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

Yep, very important to realise that the niftiest sounding setup is NOT the same as the torquiest setup. A common muffler (or twin mufflers, but with a balance pipe connecting the two exhaust pipes) will give better torque than a completely split system.