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The rear lower control arms also received an upgrade thanks to GodSpeed Project and their newly developed CNC'ed lower control arms. The key factor which sets these arms apart from a majority of the rear LCAs available for FF Hondas are the spherical bearings as oppose to polyurethane or rubber bushings frequently used by several companies. 
The spherical bearings not only are beneficial from the fact they are non compliant to cornering force, but also have minimal stiction. Another factor is that the inner subframe mounting point, the middle damper fork mounting point, and the outta knuckle mounting point, don't all reside at the same angle nor do they articulate in the same manner. This is where other rear LCAs for Honda's can see issues, since each poly bushing is seeing different angles in load which can lead to prematurely cracked bushings. 
Much like most of the aftermarket rear LCAs on the market, the GSP arms have mutiple rear sway bar mounting locations for ideal endlink positioning.One of the major rules for the MPTCC series(more on the rules here) is that the same set of four tires has to be used for the entire race weekend. So warm-up session, qualifying, and 30 minute sprint race both Saturday and Sunday. Having a durable and predictable race compound tire is a must for consistancy and speed through out the entire race weekend. From my positive experience with Maxxis and the RC-1 tire on Project 370z (read about the RC-1 and my Nissan), I opted to run the same tire on Project EF just in a much smaller, Civic friendly size.
At a size of 225/45/15, this is a much smaller stack of RC-1s that I'm used to seeing from the set Project 370Z uses. But for Project EF's light overall weight and low torque output, this is a great size and diameter for both handling and effective gearing. 
The Gram Lights 57DR wheels in 15×8 will utilize the 225mm section width perfectly. I did in fact break out the measuring tape to see how “225” the RC-1s really were. They're closer to the “230mm” end of the spectrum so I have no complaints whatsoever.
