This completely brings the GR to life. If you want blowoff sound without mess with VTA blowoff.... here it is. This thing sounds amazing. The flutter, the blowoff, the suction... everything is top of the line. With people dynoing this as an only mod and getting hp gains of 14-16+ is ridiculous with no tune, you definitely can feel the throttle response come to life. The install is pretty easy, a couple difficult bolts here and there, but the instructions are EXTREMELY well written and helpful. I would buy this again and again.