Interesting. Never head of Extend Concept but their site seem to indicate they are relatively new to market. I also don’t see a model number for Mazda5? How much do these cost?
From what I can tell, they look *almost identical to YellowSpeed coilovers with incorrect end link mount tabs (sticks out at 45degree angle with a round end) and both are made in Taiwan and follow the same MO, R&D through their own racing circuit/team. A physical difference is Extend Concept actually welded on a bracket for the brake line whereas YS provides afterthought brackets that are worthless. Another BIG difference is the low end of EC do not come with a pillowball top whereas YS do (this is better difference). It looks like the EC use thrust sheets and washers for both top and bottom (don’t see depth for roller bearings so I could be wrong) but this is not necessarily a good or bad thing; more of a practical and preference thing. The count of accordion groves on the EC rear dust boot is two less than YS (I use this as a guestimate for stroke travel but they could have different lengths). Another minor difference is EC offers 30 vs YS’s 33 adj. setting. YS etches/labels their name on most components, which I don’t see on the spring. What are the spring rates for front/rear? Do you have more pic?
BTW, did you try to mount Tein’s EDFC on top of the EC COs?? Does it fit and does the adjustments work in set increments? Can you rebuild the Tein? If not, what do you do with a broken set of Cos?
