I have dynoed about 260 lbs of torque on a roots blower on my other car and I put urethane mounts in it. I've seen these hold up on on cars with a lot more power to the ground than myself as well, although most that have 300lbs of torque and 300+whp usually switch to solid billet mounts.Im not sure that is a good Idea with 300lbs of tq. I dont have that much yet but its a goal. but for the N/A 6s thats not a bad idea. Id like to see someone try this.