If all that you're going to use the car for is track runs then what's
the problem? Full headers running strait down the car would do the
job. Of couse I did install a true dual exhaust on a 82' Z28 a few
years ago, I can't tell you who manufactured it but it did come in a
box. Both pipes ran down the driveshaft tunnel and into individual
mufflers. It sounded like a bus and didn't live under the car for a
great amount of time.
I have a 3" single exhaust running under my 88' Bird at present and it
does a fine job. I think that you could probably get a similar system
up to 4" but don't recall seeing one recently, though I'm pretty sure
that they can be had.
68' RS Camaro
88' Formula Bird
Some are wise and some are otherwise
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