![]() I recently rebuilt my C6 auto, and the way the exhaust is now, the two pipes come together right near the transmission pan by the pressure outlet on the trans. The previous owner had swapped out a 460 into it. I will post again after installation.Hey everyone, thanks in advance for any advice you can offer! I am trying to figure out header options for my 1970 F250 camper special. They are about the same size as the originals, based on the dimensions Alan posted. ![]() They should fit OK in the stock location with some tubing mods. I am hoping the additional expansion room for the hot exhaust gases upstream of my mufflers will reduce the sound enough that I can live with it. They are oval-shaped 4 1/2" X 6 3/4" X 10" long stainless cans with a straight through design similar to my Magnaflow mufflers. I have ordered a pair of Vibrant 1140 Ultra Quiet's. John, I am taking your advice and will try adding resonators first. The wildcard will be the resonators as they may be what drops enough DB's to your liking so resonators is where I would start. Either you make it quieter but lose a little of the efficiencies a straight through will provide or go with a chambered that can drop the DB level to your liking. You said you wanted to retain as much of the performance you have built so I agree that a straight through will help in that area but it's a compromise. Straight through mufflers will always be louder than chambered ones because they're.well.straight through. I would be interested to hear if anyone has done this and their impressions. ![]() ![]() These are available in 11" and 14" lengths in my tubing size. Use of a 2-in 2-out oval muffler as a resonator serving both sides. Likely would be 4x14's if we can fit them.ģ. I'm not sure if muffler volume trumps length but I think so. I think larger diameter might work and a 6" muffler has lots more sound absorbing material even in 14" length compared to my 4X18's. Larger or longer mufflers in current, stock location. Sorry guys, I just don't care for chambered mufflers.ġ. All would use straight-through absorptive non-fiberglass type mufflers, Magnaflow or similar, as they are my preference for sound and preservation of performance improvements. I meant under the REAR seat not the passenger seat.ībogue wrote:I will take a look at my setup with my muffler guy and see what he can do. They were part of the tailpipe and not listed separately in the parts catalogs.īrain fart. The original one I measured had the outlet pipe centered in the oval, while the inlet end was offset toward the center line of the car: an illustration in the 1962 Ford Car Facts binder, which is reproduced in VTCI's 1961-1963 Original Factory Specifications (OFS) manual in the Undercarriage section, shows the inlet end offset toward the center line of the car and the outlet end offset toward the outboard side of the car. They were approximately 10" long x 8-1/2" wide x 3-3/4" high and had a flattened oval in cross-section. Resonators were used on '61-'62s with the Z-code/300 hp engine and its 1-3/4" tailpipe system - they were placed under the rear seat pan slightly forward of where the tailpipe kicks up over the axle. Bbogue wrote:I didn't think these cars had resonators since there is so little room for them.Īu contraire', mon frer (? - sorry, I didn't study French when I was young).
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