N/A Downpipe Size Question

[btwilson86]

Originally Posted by fullthrottlesrqsupra

one full size all the way back actually ending up a tiny bit smaller at exit

Actually, you want to start out smaller and end up larger. After combustion you want a smaller diameter pipe to maintain the velocity of the hot exhaust gasses. The further the gasses travel, the cooler they get. When the gasses cool down, their velocity decreases causing more restriction in the flow. To avoid this, you increase the pipe size, allowing more gasses to occupy that portion of the pipe.

So, start smaller, end bigger.

Let the arguments begin lol