What about running them on the front only? Or should I do I all 4 corners.

How long (miles) should they last.. (Not including track days)

 

I'll reiterate what cdelena said, don't mix pads with different characterisitics. Ive been using the Porterfields on my car since December. They give much improved braking power and control on the track and are much less subject to heat-induced fade. They also last longer than stock pads when subject to the extremes of track use. That said, I prefer the OEM pads on the street - they modulate well when cold and produce a lot less dust - plus they're less expensive. Therefor, I run the Porterfields on the track and switch back to OEMs on the road.

 

This is what I was thinkin'.

Where is the best place to buy them?

 

I don't know if it's the "best" place but Bulletproof Automotive, one of our sponsors, sells them. I bought from him when he had a group buy on the R4S pads and was very happy with the service.

 

Using R4's for autox but they seem to drag, and are eating the rotors alive. But man does the car stop!

we've swapped the rears only back for my daily driving of the car and haven't had any issues. Basically it's an issue of sheer laziness as to why we didn't put the fronts back - swapping BOTH nearly every weekend is a pain... so we did just the backs (since they were the ones dragging on the rotors).

No problems so far, and it's been moderately chilly (below 40) as well as decently warm (mid 50's) and haven't had any issues with my "spirited" daily driving of the car.

 

I have been using the R4S on the front alone for a long time now and so far no issues by using different pads on each end.

Remember that most of the braking is done by the front brakes, rear brakes do less work (weight transfer issues, vehicle weight, etc) hence you don't need the same level of braking at all ends. You could end up with a car prone to locking the brakes on the rear very easily before the front ones lock. Of course on our car we have ABS but you get the idea.

I have gone in the past with same agressive pads on all four corners and, depending on the car and track, ended up using a less agressive pad or the stock ones on the back. Sometimes I mixed Hawk blue on front with Hawk black on the back. Works even better on FWD cars.