More cost effective Brake upgrades ??

[Lightning]

Some people confuse initial "bite" or "grab" with ultimate stopping power because it is very noticeable. The easiest way to increase "bite" on a road car is to increase cold pad friction and rotor diameter. Although it is entertaining (and somewhat reassuring) in dry conditions, too much "bite" can actually be a safety hazard in wet or slick conditions. It is actually more important to have a system with a fairly wide modulation window, rather than on/off like a light switch.

To complicate matters, many race pads have to be warmed up to get to their optimal stopping power, through repeated braking cycles, something that is less frequent in street driving. Some of the best enduro race pads have very low friction in the first application out of the garage (or driveway).

Any good "sport" pad will help a lot on the street, but it will probably be slightly noisier and dustier. Oh well. Also make sure your fluid is properly bled and that the rotors have NO grease on them. If you still have a problem, you might still have a sticky piston.

All the modern Porsches already come with great brakes that have been fade tested well beyond most other car manufacturers (as well as suspensions that are capable of more cornering speed than you could ever safely use on public roads). All the Boxster brakes are made by Brembo, and there are actually VW and Audi guys (and some older Porsche owners) waiting for you to take the brakes off of your car so that they can put it on their cars.

For the street, focus on getting great tires and great pads, and the rest is tweaking.

p.s. As far as putting base model front calipers on the rear, you should listen to insite, as he is a pretty smart guy. It did not occur to me that both the base model and the S use the same brake piston diameters (fronts 40/36mm, rears 30/28mm), so I checked, and he's right. Unless you have a way to adjust brake bias (and most street cars don't), putting the same size pistons front and rear will cause massive rear wheel lock-up (or massive puttering, with ABS). Not fast, either on the street or the track...