Super Traps are crap in my opinion. To make them flow well you need lots of extra discs and longer srews for them.
I put one on a 1994 Plymouth Duster with the 3.0 ltr V6 efi Mitsu motor in place of the stock muffler. With no discs it was a teeny bit quicker and quieter than the open pipe, but slower than the stock set up. With the discs it came with all installed it was still slower than stock and louder. After every two passes I would add two discs and every time it would go a bit quicker. At a total of 12 discs it was as quick as the stock muffler. The quickest passes were done with 18 discs!! When I got to 20 discs and more it stared to go slower again.
I had bought the 4" muffler with the stainless casing and the extra discs I had were bought used. After driving for a year the case screws rusted out and all the discs and muffler packing ebded up blowing out of the casing and got smashed by a semi. I then had a very loud stainless megaphone. To my suprize a 2 chamber 2.5" flowmaster was exactly equal in powerto that ST and sweeter sounding too. Both of these set ups only picked the car up about a tenth of a second in the 1/4 mile and the FE was better by maybe a quarter of a mpg better...not worth the cost.
One last note...putting a gutted cat in place of the stock one did not make it quicker in the 1/4....made it about .4 slower and over 1 mpg worse FE. Only after I did several other mods to the car did it finally respond to a freer flowing exhaust!
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42 time NHRA/IHRA drag race champ
05 SRT4-12.17@117 mph on DOTs-31.0 mpg-SOLD
96 Geo Metro-3 banger-60.1 mpg-SOLD
95 BMW M3-13.41 @ 106 mph-31mpg-SOLD
77 Chevy Monza with 350/350-FOR SALE
84 Horizon-1880 lbs-29 mpg
95 Neon-43 mpg
99 Z28-10.80 @ 127 mph-27.1mpg
2011 Prius-62.1 wife's
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