quietest exhaust they offer. Stillen also offers a "quiet" exhaust, but keep in mind that any aftermarket exhaust is going to be louder than stock, in some cases much louder. Member Gordo posted a message in the last several days about how he inserted a venturi pipe which quieted his aftermarket exhaust greatly. Might try searching for that post.
Regarding the clutch, RPS street or JWT get great reviews around here. I like my RPS.