I had a convo with my buddy earlier today at breakfast, and he was talking about stock downpipes. His freind has a early 90's civic, and he bought a 2.5" exhaust, but found out the stock downpipe was a whopping 1.75," thereby decreasing the new exhaust's performance effects.
That got me thinking about MY stock downpipe. I have 2.5" cat-back (HKS Hiper) and was wondering what the size is on a stock downpipe on an s13 (93 to be exact).
Anyone know?
Nick.
