so at the moment i have flowmaster 40's and someone told me that flow masters make it have less HP..1.is that true? if so what should i get for the best sound for the money?
Flowmasters (and chambered mufflers in general) don't flow as well as straight-through mufflers, but we're talking 1-2HP. It's negligible to say the least. Get whatever sounds best to you, forget power in this case.