Underbody Exhaust Help...ERA 427 Street

[blykins]

I would definitely look into another pipe/muffler option. A 2" diameter pipe is going to choke the poo-poo out of an engine. On a 500-600hp engine, I usually recommend around 3" exhaust.

With that being said, most sidepipes are killer restrictive as well and you usually can't even roll a golf ball through one.

I would have your builder or ERA look into some different options. There are oval pipe and muffler designs out now that will fit into small areas and increase flow area.

[DanEC]

I'm fitting a full 2-1/2 inch exhaust system - out the rear - to my ERA. The mufflers and headers are out being ceramic coated right now but I hope to have them back and hung within 30 days or so. Do you have the standard ERA Jag rear suspension or the ERA suspension? ERA says you can't run tailpipes with the ERA suspension, although I suspect if it was custom fabricated to run up real high up and over the rear half shafts - it might fit. But - I can't be sure. It's possible that run up that high the tires may start to hit the pipes even if the suspension clears them. So, if you don't have the Jag suspension you may be stuck with the exhaust turning out in front of the rear wheels. I'm managing to fit 2-1/2 inch tail pipes by virtue of using the Jag rear suspension and only running a 255/60-15 inch tire in the rear. Even then it is tight.

If the quality of the exhaust sound is the main issue, I don't know how much difference tailpipes will make in the car's sound. I'm using Spintech mufflers which I understand are pretty loud. The usual means of mellowing out a car's full length exhaust system sound (besides muffler selection) is to run an "H" or "X" pipe connecting both sides (and increase power slightly also). It probably wouldn't be impossible to do so on a Cobra - but it would be a real challenge.

[mdross1]

When building our car knowing we were going go with undercar exhaust used 1/8" plate welded flush with floor making for solid feel and never feel any heat from the mufflers.We used Stainless Specialties custom made stainless chambered mufflers 2 1/2" out the back.They sound just right.