Where would be the best place to install an x-pipe on a 71' duster?? Right after the headers or further back near the tailpipe tips. I ask this because the drive train is in the way almost the whole length of the car.

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Don't ever take a fence down until you know why it was put up.
-Robert Frost (1874-1963)

After the Headers, but still the X-Pipe will be visible from below car

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Mopar Muscle is well defend by Slant Six!

Valiant Duster 1971

Just a suggestion....go headers to 2.25" primaries about 32" long to a flowmaster "Y" and then to a 3" single exhaust through a single muffler. You might find 2.5" single to be enough. You get the advantages of a "X" and the lower price of single pipe and muffler.

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

But a single exhaust don´t look very sporting!! while two looks sporting, and is more probably to get a V8 Engine sound with two exhaust.

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Mopar Muscle is well defend by Slant Six!

Valiant Duster 1971

The X-Pipe is more effective closer to the headers. I'd have to agree that the dual exhaust looks better, and has a really cool sound to it. Doesnt sound like a V8, but with the right mufflers it definately has a strong aggressive sound to it

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Ryan Covalt
62 Plymouth Valiant Race Car 2170# 11.008 @ 117.65 MPH 1/4 Mile Best
72' Dart Swinger Street Car, 4 spd, 3330# 14.061 @96.58 1/4 mile Best

I have true duals with a balance pipe placed just before the tail of my trans ends. I have a 904, for ballparking purposes. I have a very nice yet almost stock quiet low end, it "brrrroomssss" a li'l btwn 55 and 58 mph (nothing big, I had the same issue before installing my balance pipe and the balance pipe made it much less noticeable, now I can listen to ther music if I want, still I rather listen to my slant....)
But the low end ended up very enhanced by adding the balance. I have headers, 1 3/4" primaries, 2 1/4" tailpipes to the end.

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

from a performance standpoint...
which is better- duals or free flow single with a y?

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My Dart
GO VOLS!
It's not rocket science, we're just splitting atoms.

Somewhere I read the following idea, have not tried it. Put a bit of paint (not high temp, just regular) on the pipes. Drive the car in your normal fashion. Where the paint starts burning off first is where the pipe is the hottest. That's where the crossover needs to be installed, to do the greatest amount of benefit for the system.

- Erik

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Lots of early Valiants and Barracudas have crossed my path.
Also a handful of other toys for variety now and then.

I would bet that, properly engineered, it doesn't make a difference. The fastest cars I know use a Y into single pipe (2.5" up to 3.5"). I have a single 3" on my fast car (14s in 1/4).

A big recommendation from Cameron Tilley, owner of two of the most powerful Slant cars in the world, is to run your primary pipes down about 0-8" past your trans X-member, and then into a Y to 3" or 3.5" single. My 64 has the Y just ahead of the X-member, so I'll be moving it back soon.

Lou

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