Ideal for the track and race inspired 350Z & G35 enthusiasts; Agency Power has released its new resonated test-pipe! These resonated test pipes are designed for optimized exhaust gas flow and maximum power. This product is recommended for track/off-road use only. You will hear the difference the Agency Power resonated test-pipe has to offer upon installing, offering the deepest sounding tone of all 3 of our test-pipe options. Agency Power is recognized worldwide as an aftermarket the leader in complete exhaust system upgrades built with the highest quality, designed for optimal flow to produce amazing sound and powerful gains.