Rear tire width requirements in relation to HP?

The only 15 inch tires I will run on either of the rears of my Mopars are Nitto Drag Radials. They are the only tire which make my Mopars safe to drive on the street. They have a 186mph speed rating, last for several years if not used to make smoke signals and give adequate performance in the rain. They are not a cold weather tire though, and are not recommended for climates that drop below freezing on a regular basis. Once warmed a bit, they are unbeatable for street traction and vastly superior to any other street tire out there for general performance including handling.

I've run pinion snubbers on my cars for years. Its been a while since I've dialed one in, but if they are adjusted correctly, they are very close to touching if not touching the floor pan of the car depending if automatic or manual.

Once adjusted this way, the quality of the ride the rear suspension is capable of providing is much harsher than I am willing to put up with on the street. This happens because it stops the nose of the rear end from stroking through its otherwise normal range of travel. The remaining travel is limited to the amount that the rear spring segment will allow, while being contorted due to the locking up of the front spring segment by stopping the nose of the rear end from moving. They work great on a smooth track, but are brutal on the back for normal open road driving.

I wish someone would make a robust pinion snubber that was switchable from deployed to retracted positions from inside the car. Then it would give the best of both worlds.