> Borla make a selection of stainless straight through mufflers in different
 > shapes and lengths. We ran an oval shaped 3" for a year and for 2000 ran a
4"
 > round. Both gave us under 98 DB at full throttle 50 feet from the car with
a
 > bridge ported 12A.
 >
 > Lynn E. Hanover

 What was the length of the pipes before the muffler Lynn? I ask because I am
 trying to judge the temp they were running at. Also what did the 3 inch
 oval muffler weigh?

The header tubes are 22" of 1 7/8" ID tubing to the 2 1/4' collector, then a
3" tailpipe 65" to the muffler. My EGT probes are 3" from the flanges.
Looking for less than 1650 degrees. The oval 3" is about 12 pounds. But it
was their longest one. This year we had the same front end to the collector
then a 18" megaphone to the 4" round muffler. The tube through the muffler
was 4". The muffler is more like 7" in diameter. Much too large for an
airplane. It is also much louder than the 3" system. The bigger 4" is about
15 pounds. The formula Mazdas use smaller Borlas with 10" to 12" 1 7/8 ID
tubing to the collector then less than 2 feet to the muffler. They have a
number of designs to choose from, and they probably can give you the weight
for each one.  Lynn E Hanover

 
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