Underbody Exhaust Help...ERA 427 Street

[lippy]

Originally Posted by strictlypersonl

There are outriggers from the main chassis rail with 19.25" longitudinal distance between them.

4" from the floor surface to the bottom of the chassis rail.

The box containing the brake master cylinders (in front of the muffler cavity) extends out from the main rails 5", so that the muffler "In" must be offset to the outside. The muffler "Out" must be centered or in-line with the "In" pipe. It cannot be on the opposite side.

Bob - what about the MagnaFlow 11376 (http://www.magnaflow.com/02product/s...ain&id=10390)? It is 11" long, with a 4" x 9" oval cross section and 2.5" circular inlet/outlet. This model has both inlet and outlet offset/aligned, but it can be configured several ways.

[DanEC]

Originally Posted by lippy

Bob - what about the MagnaFlow 11376 (http://www.magnaflow.com/02product/s...ain&id=10390)? It is 11" long, with a 4" x 9" oval cross section and 2.5" circular inlet/outlet. This model has both inlet and outlet offset/aligned, but it can be configured several ways.

You really need a center outlet if running a tailpipe. You might be able to use an "S" shaped adaptor on the outlet to adjust the tailpipe. If exiting in front of the rear wheels it might work. At 4 inches depth it will hang down more than my Spintechs - but no more than most.

Here are a few pictures from my mock up. No - my tailpipes will not be PVC.

[strictlypersonl]

I found some Magnaflow mufflers that look close. Note that they are 4" tall, so they will hang below the chassis a bit. Also note (in case there are some lurkers with other than our late 427 model), that early (pre-731) 427s, FIAs and Slabsides only have room for a 14" long muffler.

Universal design
XL Series

I don't know the performance difference between those designs, but the second one is available in a longer case. I'm also assuming that the oval XL series can have the flow in either direction.

[RodKnock]

Originally Posted by DanEC

No - my tailpipes will not be PVC.

Well, you never know. I think Patrick used PVC for his roll bars, though it's hard to tell with the PVC insulation wrap around them.

BTW, Dan, really nice work.

[DanEC]

Originally Posted by RodKnock

Well, you never know. I think Patrick used PVC for his roll bars, though it's hard to tell with the PVC insulation wrap around them.

BTW, Dan, really nice work.

Thanks - I hope to have some pictures of the complete system in a few weeks.