Exhaust pipe dimensions for 1998 HB DX
 

My measurements of the stock piping obtained by wrapping measuring tape around the outside of the piping in multiple areas are as follows:
Circumference = 14.00 cm (5.50 in), therefore:
diameter = 4.56 cm (1.75 in)

I was looking for an axle back exhaust for my car but all the aftermarket diameters are over 1.75 inches. If I were to buy a catback exhaust in order to keep the same pipe diameter throughout, what would be a good diameter? Nothing has been added to the car but may add a short ram or cold air intake.

Re: Exhaust pipe dimensions for 1998 HB DX
 

It seems that most aftermarket catback exhaust pipes are either 2.5" or 2.25" in diameter.