Been out of the loop for awhile so not familiar with what exhaust tips out there are correct and of good quality. Redoing the exhaust on my 70 RR and would like to add tips this time. Looking for some to work with a 2 1/2" system. Looked at the stainless ones at Mancini and also think the same ones are on ebay for about $50 less. Any guidance is greatly appreciated.