MY06 3.0r-b Exhaust and Power Steering Question!

Greetings!
I have a two questions!
First, Would changing the the exhaust tips to a larger size produce that "Porsche note".
The "Mid Section" has been done by the previous owner according to my mechanic so i figure maybe replacing the tips will uncover that sound im after.
Also, would there be a recommended size to achieve a tasteful sound?
Secondly,
The top o-ring on the inlet hose is F!@#ed and letting the fluid become aerated.
Does anyone know what size/type of o-ring is needed to replace?
Thanks All,
Rhys.
I have a two questions!
First, Would changing the the exhaust tips to a larger size produce that "Porsche note".
The "Mid Section" has been done by the previous owner according to my mechanic so i figure maybe replacing the tips will uncover that sound im after.
Also, would there be a recommended size to achieve a tasteful sound?
Secondly,
The top o-ring on the inlet hose is F!@#ed and letting the fluid become aerated.
Does anyone know what size/type of o-ring is needed to replace?
Thanks All,
Rhys.