The original 8V inlet pipe is plastic and has a bend in it. Once the intercooler is in place, this pipe will no longer fit. An inlet pipe from a "B" engine turbo, such as a Saab 99T or an early 900T (1979-1981), fits perfectly. It's aluminum, and can be polished to a near mirror finish. Also note the difference in grommets between the two styles.

If such a pipe is not available, there are other alternatives, such as using a custom pipe from an exhaust system. The inlet pipe is under vacuum during engine operation, so whatever is used must seal airtight. The pipe is 2.25 inches in diameter.