Exhaust mod, what to use?

[PhredValk]

Once again in mid-winter I'm looking at exhaust mods that I may never do.

If one were to do a QueExpress glass pack mod, and wanted to add a cross-over pipe, what would you use? You'd need nipples welded to accommodate the cross-over, and it would have to be at the front of the exhaust. For the heat, would you use copper pipe, steel or galvanized? Stainless would be perfect, except for welding it into either the stock can or the swage nipple reducers. Welding stainless is a bi*ch!

Inquiring minds and all that.
Fred.

[junior]

well phred, welding stainlees aint as much of a bitch as you think, it all depends on how your set up.
tig is the best if you want the purest and pretty weld. it can also be mig welded, i have many times just used 70xxx solid wire and cO2 inherit gas. looks like a crap stain but it dose work. then there is gas welding with an oxy-acc torch,(some call it brazing cause of the brass filler rod) and your exhaust never gets hot enuff to melt the brass.

but what it all boils down to is practice...............

if it was I i would ether find or umake the shorted glass-pack that I could find make my T joints on the front end of them for the cross over pipe and there is no reason to go over 1.5 inch pipe (exhaust tube) for this. but draw it,research it before you do any cutting or buying

[R J]

Here is the cross over pipe I put in MGM about 6 or 7 years ago.



Another shot.

[Disco]

Thanks for the pics, RJ.  I've been wondering about the same thing with my permanent lift adapter and quad horn setup in there...   

[PhredValk]

Thanks for the info and replies. RJ, did you notice any change in sound or power due to the crossover? The consensus from a few hours of reading says yes, but I'd like to know if it's really worth the trouble...

If I do this it will be in a friend's shop, with a stick wielded by a journeyman welder. A long weekend project on the farm with good friends.
Fred.

[Momz]

PhredValk

Those Swage Adaptors have gone through the roof in price.
I was able to obtain SS 3" to 1 1/2" reducers for $20,00 per pair from "Woolf Engineering".
Woolf builds custom exhaust kits and all types of specialized aircraft quality components.

www.woolfengineering.com

[dr.danh]

Missed this. What is the advantage of a crossover pipe?

[98valk]

Thanks for the info and replies. RJ, did you notice any change in sound or power due to the crossover? The consensus from a few hours of reading says yes, but I'd like to know if it's really worth the trouble...

If I do this it will be in a friend's shop, with a stick wielded by a journeyman welder. A long weekend project on the farm with good friends.
Fred.

will always lower the sound.
power will be at certain RPM ranges based on the size of the cross over pipe. sometimes re-jetting is required. usually the power increase is in the higher rpm ranges, not in the 2-3k rpm range.  I posted a few yrs ago details from a circle track article for v-8 engines. it was either on this new board or in the archive board.
there are many articles and exhaust header design companies that state for a 6 cylinder opposed engine (V-6 or boxer) a cross over is not needed and does nothing for power. one such site below mentions it. There are other sites out there that get into detail why a v-6 or boxer doesn't need a cross over.
http://www.performance928.com/cgi-bin/page_display.cgi?page_nav_name=exhaustuPp&pass_parent=1128