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Exhaust and pipe dreams: Boom Tubes with subframe connectors
#1
My mind rarely sleeps. It's always looking for "something different". That can be problematic sometimes Big Grin

On our cars, has anyone considered or accomplished subframe connection INSIDE of the cabin? Initial thoughts are for NASCAR style boom tube exhaust clearance. Electric cutouts would be used to retain a proper rear exit, quiet and hidden w/ turndown tips, muffled system.

Since I will be needing to replace my LR footwell due to rust, I may consider clearancing the floor (also known as "choppin' 'er up with a zinger wheel") to install tubing tying front and rear together so it wouldn't hang down any lower than the OE "frame" sections.

I wouldn't be opposed to sectioning/relieving/boxing said connector so the boom tube(s) could function.

Can yinz see where I'm headed here?
C'mon, follow me down the Yellow Brick Road, open a beer and chime on in... beer

Pete - MotoArts Decals and Signs
'71 Sportsroof 351C-4V/4-speed - FINALLY under construction - no, wait, on hold again...
'90 Mustang 7-Up 5.0 ragtop, rolling beater
'66 Sunbeam Tiger Mk.IA, survivor
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#2
No reason why the raised subframe connector shouldn't be possible - it's done here on an earlier Mustang:

http://www.popularhotrodding.com/tech/13...to_13.html

Popping the connecter upwards under the platforms as shown above is idea, as it does not ruin the comfort of having a subframe connector splitting the front floorpan section below your feet.

As for the boom tube: Be ready to put some heat shielding on your floorpans.

-Kurt

[Image: satellite-valiant-mustang-license-tags-signature.png]
How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
Rule #3: Buy from trustworthy people: Fellow forum members. Visit 7173Mustang's For Sale forum.
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#3
BINGO!
Yep, that was a short trip. Exactly what I had in mind, thank you. Those pics are perfect.

Wonder why they don't advertise '71-73 fitment? I don't know the difference between the '65-70 and '71-73 floors... wheelbase maybe? Can't be that much different in making the SFC's work.

Car will be getting converted to factory AC. I have some heat shielding ideas in mind, and even if I don't boom tube it, it should be comfy enough and insulated within reason. I hope.
On my Dad's '57 Fairlane that was converted to 351W, I had welded 1/4" nuts to the exhaust downtubes and midpipes to accommodate some thin, rolled aluminum plates attached with allen bolts as a reflector. The aluminum wrapped about 1/3 of the outside diameter between the floor and pipes and couldn't be easily seen. Unfortunately we sold the car before completion so I never did get to test it out.

Pete - MotoArts Decals and Signs
'71 Sportsroof 351C-4V/4-speed - FINALLY under construction - no, wait, on hold again...
'90 Mustang 7-Up 5.0 ragtop, rolling beater
'66 Sunbeam Tiger Mk.IA, survivor
  Reply
#4
The front framerail/floorpan reinforcements on the '71-73s are wider apart than on the '65-70s (Ford's brilliant method of shoving the 429 in the Mustang was simply a case of spacing the framerails a bit farther apart than on the previous models), which will require you to angle the reinforcements to meet the narrower rear framerails.

Obsidian71's custom coupe progress thread had some great rotisserie shots which show this difference, and the manner in which he fabricated his custom connectors.

-Kurt

[Image: satellite-valiant-mustang-license-tags-signature.png]
How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
Rule #3: Buy from trustworthy people: Fellow forum members. Visit 7173Mustang's For Sale forum.
  Reply
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