its a modification to the original 5Zigen Design where you have a resonator between the two mufflers. We added a flange there so you can go from "street legal" to "race" by swapping the resonator with a 90° cut-out pipe.
The really nice thing with this mod is that when at idle the exhaust sounds completely "street" and only when depressing the throttle over say 50% the cutout makes that extra noise. So you can drive the exhaust daily even with the cutout mounted and it only gets loud when you wish to.
The reason for keeping the resonator as an option is mainly because we need a "ECE-certificate" (ECONOMIC COMMISSION FOR EUROPE) for being street legal.
Chris
PS: all outdoor scenes and the final dyno run are with the cutout installed while the sound during the exhaust installation is with the resonator mounted (driving the car at the F1 Grandprix track Hockenheimring in Germany).
__________________
ProStreet N1 exhaust | ProStreet N1 Y-Pipe | STILLEN G3 Intake | NST Pulley Kit
EIBACH Pro-Springs | EIBACH Pro-Spacers | EIBACH Sway Bars | SEIBON GT2 Rear Wing
MOCAL Oil Cooler 25row| STILLEN TransCooler | STILLEN PS Cooler | STILLEN Front Fascia
|