Use this MagnaFlow exhaust system when you're exploring off - road terrains or cruising on highways. It's perfect for Subaru Crosstrek owners who want to enhance their car's performance and sound. The main piping has a 2.5" diameter, and it goes through an 18" offset - offset oval muffler. The exhaust exits through a 3.5" black chrome tip on the passenger side rear. It replaces your OEM exhaust system from the catalytic converter on back and is made of high - quality stainless steel.