Are the Tamil Muslims similar to the Malay Muslims?
The 
Aqidah of the Tamil Muslims is based on 
Sunnah basically influenced by the 
Sufis. Tamil Muslim families are 
patrilocal though their marriages incorporate Islamic 
mahr
 practice. For instance, it is common to see a groom pay the bride mahr 
sum of 10,000 rupees and the bride in turn would pay the groom a dowry 
sum of 100,000 rupees, though practice of dowry is banned by Islamic 
doctrines.
Tamil Muslims practice 
monogamy and 
male circumcision.
Like the 
thali of Tamil Hindu brides, Tamil Muslim women wear a chain strung with black beads called 
Karugamani which is tied by the groom's elder female relative to the bride's neck on the day of 
nikkah.
As a mark of modesty Tamil Muslim women usually wear white 
thuppatti
 (from Hindi/Urdu duppatta) instead of the black burqas (that are 
popular among Urdu-speaking Muslims) which is draped over their whole 
body on top of the saree. This has remained a hurdle in 
genealogical research.
Almost all Tamil Muslims go to Qabr (
Dargah) 
ziyarat which is an important 
Sunnah.
The global 
purchasing power of Tamil Muslims in 2005 was estimated at almost $8 billion 
viz. $3 billion in Tamil Nadu, $1 billion in Malaysia, $600 million in Singapore.
Tamil Muslims have historically been 
money changers (not money lenders) throughout South Asia and South East Asia.
Generally Tamil Muslims are involved in various trades like retail, mutton shops, shops in foreign bazaar. They are also involved in gems 
trade & leather industry.
Due to the plenty opportunities in the Gulf region, a lot of Tamil Muslims went to the Gulf. Now Tamil Muslims are spread over in the Gulf countries and also in 
Singapore, Malaysia and Brunei.
The Tamil Muslim 
community is a prosperous one. There are about 400 millionaires within the community and at least one billionaire 
viz. 
B.S. Abdur Rahman (better known as the 
Buhari Group) who constructed the conglomerate 
ETA Star Group, 
Chennai Citi Centre, 
Chepauk Stadium, 
Marina Lighthouse, 
Valluvar Kottam, 
Government General Hospital, 
Gemini Flyover, 
Crescent Engineering College, 
et al.. He owns over 70 ocean-going vessels (ships).
Source:  
Tamil Muslim (Wikipedia)