Ask Shiv, or someone else with real tuning expirience what these things can handle, but even then I would guess its just a ballpack educated guess. Bottomline if you are uncomfortable and don't want to spend $$$ when or if it blows on you, don't do it. No one really knows what the true torelances are, and we wont know until someone's car goes ka-boom! And you can be assured some poor soul is going to findout at some point. Then we will all have a better idea.