Porsche front brake caliper adapters...

[Error404]

I'm relieved you've seen the light & getting professional help with the carriers

Regardless of "size" the fixed 4 pots are a better caliper & will be an upgrade for you. I would think they are a good match for a 323mm S8 disc.
Personally if I was going to the expense, I'd use the 18z cayenne six pots and something like a Phaeton W12 rotor - more bang for your buck

[junkeravant]

4 piston Cayenne caliper is a no go....

Apparently many people are saying here in the States that the 4 piston Cayenne caliper has an inferior piston area than my OEM A4 caliper now. In fact they say that is why Porsche went to 6 piston on the calipers after realizing the 4 piston was not good enough to stop such a heavy vehicle.

[junkeravant]

Saw this on a Volvo site...is this even safe to use? The poster claimed it is a 10mm mild steel set up. He is using radial mount Aston calipers.

[quattrostyle]

Looks beefy enough to me

Are you talking about the 4-pot Cayenne rear calipers? I believe that's what I got and what I'm planning to use in the future on my type 85 car.

[junkeravant]

In this instance they were for the front...

I have changed my Calipers to Boxster style. I was looking around for economical brackets to fit my A4 and this popped up.

[Wizard-of-OD]

Dont use aluminium , plenty of sheared ones on motorgeek.

fixed
Machine from steel + zinc plate = job done.

[junkeravant]

Anybody deal with this outfit?

http://www.bigbrakes4u.co.uk/hi-spec-motorsport-universal-caliper-brackets/cat_221.html

They seem to have a product hat could be quite useful to many of us.

[Wheeljack]

Machine from steel + zinc plate = job done.

This.

But it really depends on the application...

For a street car, steel makes the most sense. Between environmental factors leading to corrosion and lack of routine inspections, I will choose steel almost every time--steels have a finite fatigue limit, a trait that aluminum and titanium only dream about. These fatigue concerns are generally worsened with elevated temperatures and higher strength alloys.

I make these for street cars running machined urs4/6/v8q(non-ufo) hubs, d2 A8 323X30 rotors, and 996 calipers. They just needed some slightly tweaked dimensions from the RS2 brackets from which they are based. And, some zinc chromate conversion coating for very good corrosion resistance...

[A1QSHIP]

This.

But it really depends on the application...

For a street car, steel makes the most sense. Between environmental factors leading to corrosion and lack of routine inspections, I will choose steel almost every time--steels have a finite fatigue limit, a trait that aluminum and titanium only dream about. These fatigue concerns are generally worsened with elevated temperatures and higher strength alloys.

I make these for street cars running machined urs4/6/v8 hubs, d2 A8 323X30 rotors, and 996 calipers. They just needed some slightly tweaked dimensions from the RS2 brackets from which they are based. And, some zinc chromate conversion coating for very good corrosion resistance...

If the V8 came with UFO brakes then the hub offset is different than the UrS4/6/6+ hub.