Hello, first time user but does anyone know what size piping I should use for a single exhaust on a stock 1UZ? I know the general answer is 2.5 Inches but I want to keep the engine quiet. So I was thinking to get some OEM Mufflers to weld on but I know that could hurt airflow and power ratings. So what about a 3 Inch pipe with the 2 OEM Mufflers welded on? Most people don't do this but I figured I would be the first to keep it FAIRLY Quiet.