Mugen was founded in March 1973 by Soichiro Honda’s eldest son, because Honda Motor did not employ family. There has never been a capital relationship between the two companies. In April 2004 the business transferred to M-TEC, and the brand continued unbroken.
Mugen Wheels: The GP, the TT, and Why They Are Not All 5×114.3
The GP is forged and metal-spun, with a claimed 2.4 kg saved against the 17-inch OE wheel. The TT is cast, and Mugen credits RAYS with making its centre cap. And the range includes 4×100 and 5×120 fitments — so check the pattern for the size, not the model name.