Nor Cal Shelby Club

Courtesy chris-allison@hotmail.com

1.  FFR pipes compared to 4" longer Cobrapacks  went from 18" pipes to 22"
 
Results-while sitting in the car at idle 900rpm
Before-101
After-98-99dbs

Standing 3 feet from car-outside in open area

Before 102db
After 99db

2000rpm in 4th on flat road
Before 105db
After 105db

at 2200 in 4th
Before-107db
After -107db

108-109dbs at 80mph on the interstate in 5th
 
 
2.  Sweet-Thunder pipes compared to FFR pipes  Mike at www.sweet-thunder.com made these for me using his chambered inserts.
sitting still in the car before 101 after 98dbs
standing 3 feet away from the car-either side
Before 102 After 96dbs
Behind the car-93dbs

2000rpm in 4th before 105 After 102dbs
2200rpm in 4th Before 107 After 104dbs
2500rpm in 4th Before(never tested)After 106dbs

Video 1

http://s20.photobucket.com/albums/b2...ravideo002.flv

Video 2
http://s20.photobucket.com/albums/b2...ravideo003.flv
 
 
3.  CC inserts with packing in J-pipes with Factory Five Pipes
 
Before-101db
After-98dbs

3 feet away from pipes
Before 102db
After 99db

While cruising at 2000rpm
Before 105db
After 102db

2200RPM
Before-107db
After 104db
 
 
I also used the gas-n stainless pipes, but they were only quieter at idle.  Since then they have started using longer mufflers, so i will exclude that data.
 
Hope this helps.  The sweet-thunder pipes are the ones that i stuck with.  They are great and only caused a small hp loss. The chambered insert that he replaced the glasspack with really made a huge difference in the tone of the exhuast.  The pipes now sound like my 1965 Corvette sidepipes, or at least close to them.