Which performance exhaust???

[Tom Welch]

A 'hybrid' system may work well, too. start with 3" pipes and after the mufflers or before the diff depending on your setup change pipe diameter to 2.5" to make fitting the exhaust easier. by the time the exhaust gasses get to the differential area of the exhaust they have cooled off enough to make this type of system effective and easier to install. No power loss/gain to be had that far back in the system with big pipes. This applies to normally aspirated cars.