Exchaust

doesn't the stock piping come with 2 1/4???

DC2R#428 said:

yup but 2.5" diameter piping and aftermarket muffler of your choice will benefit your car to a degree.

Click to expand...

depends what you want out of it. I don't know one aftermarket exhaust thats 2.5 inches in a prelude...let alone a rsx type S engine. bigger isn't always better...cause mass air flow is dependent on gas velocity/pressure/ and temp. bigger pipe the velocity and temp goes down and so does the density making it less efficient. a smaller pipe with a straight through muffler like 2.33 or 60MM might actually be a better buy than 2.5 inch piping on an N/A car.

Pv=RT
M(dot) = Row x V x A