Undercar exhaust exiting ahead of rear wheel

[Tom Wells]

DanEC,

Hmmm...

Don't really have a lot of sound bites. Here is a link to a couple from Daytona: First Coast Cobra Club • View topic - Tom at Daytona - two videos

I guess the closest to what it actually sounds like would be the second clip just as I'm passing the Mustang.

Overall, the sound is nice! Sets off car alarms if you're into it but reasonable if the throttle is not too far down.

There's a lot that determines the overall sound, so yours is probably different. My guess is you'll like it!

Tom

[DanEC]

Tom - wierd deal - I couldn't get any sound off of those clips. Must be something in my computer. But thanks for the commentary.

[Tom Wells]

DanEC,

That is strange - I tried it again and it worked fine.

There's a sound volume slider on the bottom left of the Youtube picture and also one somewhere on your PC. Maybe one of them is all the way down, or one of them has the MUTE function on.

Either way, Spintech are they guys who started the high performance muffler designs for (gulp) dragsters to minimize noise while not hitting HP too much. I'm sure there must be others as good by now.

If you can, post some sound from your car when it is making some!

Tom

[tkb289]

Originally Posted by Jaydee

How quiet is it with the dynomax muffler?
Also some v8's have a balance cross over pipe, is that necessary?
With the underbody pipe, I have seen a stainless steel side plate along the body, wich looks nice and stops stone chips on the rear guard.
JD

JD,

A bit quieter than side pipes, but still loud enough to sound like a Cobra

Cruising speed on the highway is a combination of exhaust sound and wind noise, the 302 sounds particularly good from 3000 to 6000 RPM.

[DanEC]

Originally Posted by Tom Wells

DanEC,

That is strange - I tried it again and it worked fine.

There's a sound volume slider on the bottom left of the Youtube picture and also one somewhere on your PC. Maybe one of them is all the way down, or one of them has the MUTE function on.

Either way, Spintech are they guys who started the high performance muffler designs for (gulp) dragsters to minimize noise while not hitting HP too much. I'm sure there must be others as good by now.

If you can, post some sound from your car when it is making some!

Tom

Tried it again and this time I had sound. Hard to tell but with the background wind noise but in the second one there is a period when your accelerating past the Mustang that comes through pretty clear and it sounds nice. Thanks.

[tkb289]

Originally Posted by DanEC

Did either of you have any problem with the passenger side ERA collector placing the muffler a little too far to the outside to where it interfered with the body rocker area? I had to take mine down to an exhaust shop and have a 2 degree bend put in it to center the muffler in the proper area for clearance. I hate having that slight kink in it but it will only be visible from underneath. It looked to me like the shop they have fabbing up the exhaust headers and collectors isn't allowing for the 1 inch offset of the motor to the passenger side. Or maybe it was something just unique to mine.

Dan,

I did have some fitment issues on my 289 car.

When I first installed the headers, the collector on the driver's side was very close to the brake / clutch hard lines. Talked with Bob P. and we determined due to a tolerance stack up, the motor was sitting too low. Made some 1/4" thick steel plate shims that were powder coated and put between the frame and motor mounts. Next step was to level the motor in the car, used a straight edge on top of the motor as a sightline to a horizontal seam in the firewall.

Then to get the pipes / muffler to align and sit properly under the car we wound up cutting off about 1" from the length of the collector on the passenger side. The driver's side we took off maybe 3/8". A little tweaking here and there does the trick. Sounds like you have everything lined up on your setup. I would not let the 2 degree bend bother you, seems like a good solution to the problem. Be sure to add the insulation under the floor and above the muffler if ERA did not already install that for you.

I have about a 3/4" space between the top of the muffler housing and the floor insulation. No heat issues so far.

There are bound to be a few things here and there that need to be tweaked with installing parts, but overall I have to say things go together pretty well on the ERA.

When you are finished, take some photos would be interesting to see what you have done.

[terry251]

I have the under car on my Superformance, but the exit is under the rear bumper hoops. It is easier on my ears, but still sounds high performance. Most of the real Cobra's on the street back when they were new came with under car exhaust - the small blocks and the big blocks. It was years later when everyone started emulating the competition look with roll bars, side exhaust etc. The under car system is a great look! There are some pictures in my gallery.
Terry

[rpatton3]

I have a Backdraft, chassis #874, with their side exhaust. At highway speeds. the wind is as bad as exhaust noise.

My plans are to get 304 stainless mufflers that pass the "tennis ball test" or bigger grafted onto side pipes during cold weather.

If you have side exhausts, get the heat shields! They are ugly but effective.

You are wise to do your homework over and over. You are the one you have to please.

Russell

[rpatton3]

I have a Backdraft, chassis #874, with their side exhaust. At highway speeds. the wind is as bad as exhaust noise.

My plans are to get 304 stainless mufflers that pass the "tennis ball test" or bigger grafted onto side pipes during cold weather.

At very least, get heat shields; they're ugly but effective.

I wanna keep up with the big boys!

You are wise to do your homework over and over. You are the one you have to please.

Russell