I am the EBC dealer in Romania and I can help you clear some things about this brand:
1. If the pads make any noise when you dont touch the pedal, is the caliper or the mechanic fault(for nat fixing the clamps the proper way, etc). The pads SHOULD NOT BE in contact with the disc when you dont press the pedal.
2. The dealer who sold greens to a Z4 was an idiot as these pads are only meant for light sport cars(<1200KG) and no more than 150HP. the resin/lubricant caught fire and destroyed the pads so the squealing is absolutely normal because the pad was hard as a rock after it has been abused.
3. The reds come in many compounds and the old compounds are causing problems when driven hard... EBC admitted this and developed a new compound which eliminates the vibrations caused by the old one. The new compound is DM2026 and can be identified by the /26 found on the pads label.
The pad from the picture is a very old one with E388 compound. All the EBC pads are available in various compounds but most dealers sell the old ones.
4. EBC does not have a brake pad intended for race use only like Ferodo. In real applications where the car is a daily driver and took on the track from time to time, the Yellows are 3 times better than any Ferodos or other brands in the same price range. Always use Yellow with Turbo Groove discs.
From my experience with EBC I would suggest:
-Use Ultimax if you want a very good value pad and a very price effective oem alternative. ultimax should not be compared with OEM pads from premium brands which costs 3 times more. For example, the ultimax are at least as good as any OEM Honda pad but cannot be compared with OEMs from an E39 M5. Try to understand that even if the shape of the pads is the same, the compound differs by application(even if they have the same shape and are interchangeable, the M5 E39 pads will always be superior to the E39 530i ones)
-Use Greens if you want to be able to make a head through the window stop from speeds lower than 120mph. They are only good for 1 stop. Dont ask them too much, they are not for road racing.
-Use Reds for occasionally road racing. They are good for 2 consecutive and brutal stops from 120mph, after this you need to cool them down.
-If you go even near a racetrack, please use Yellow. Used with Goodridge hoses, they will feel like oem pads when cold and are capable to withstand any abuse. For mixed road/track driving, they offer by far the best performance/price ratio on the market.
I have sold over 2000 pad sets and I faced all possible situations. I always ask my clients what pads have them used before, if they satisfied with them and what improvement are they looking for.