It's not, but the piping diameter is larger to compensate... (a little)
When i first got this exhaust i came from the Stillen true dual. My car "felt" faster with this exahust on. Might be a slight increase in low end torque from increased back pressure.
Not only that it sounds amazing compared the the Stillen.
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Berk HFC & CBE, Stillen G3's, AMS Crank Pulley, JWT Flywheel,
4.08 Gears, UpRev, H&R Springs and 20mm Spacers, JDM
Rear Fog, EVO-R Front Lip and CF Upper Cover, 305's
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