Jim Smart
December 1, 2008
Quick {{{Mustang}}} Reference Guide
To Flowmaster Mufflers
Muffler TypePart No.Specifics
Series 40 Two-Chamber424432 ¼" in/out Offset Both Ends 19" Overall Length
Series 40 Two-Chamber424412 ¼" in/out Offset In/Center Out 19" Overall Length
Series 40 Two-Chamber425432 ½" in/out Offset Both Ends 19" Overall Length
Series 40 Two-Chamber425412 ½" in/out Offset In/Center Out
Series 40 Delta Flow9420412" in/out Offset In/Center Out 23" Overall Length
Series 40 Delta Flow9424412 ¼" in/out Offset In/Center Out 23" Overall Length
Series 40 Delta Flow9424432 ¼" in/out Offset Both Ends
Series 40 Delta Flow9425432 ½" in/out Offset Both Ends 23" Overall Length
Series 40 Delta Flow9425412 ½" in/out Offset In/Center Out 23" Overall Length
Series 40 Delta Flow 4098424412 ¼" in/out Offset In/Center Out 23" Overall Length
Series 40 Delta Flow 4098424432 ¼" in/out Offset Both Ends 23" Overall Length
Series 40 Delta Flow 4098425412 ½" in/out Offset In/Center Out 23" Overall Length
Super 44 Two-Chamber9424482 ¼" in/out Offset Both Ends 19" Overall Length
Super 44 Two-Chamber9425482 ½" in/out Offset Both Ends 19" Overall Length
Series 50 Delta Flow9420512" in/out Offset In/Center Out 23" Overall Length
Series 50 Delta Flow9424512 ¼" in/out Offset In/Center Out 23" Overall Length
Series 50 Delta Flow9424562 ¼" in/out Offset In/Center Out 19" Overall Length
Series 50 Delta Flow9424532 ¼" in/out Offset Both Ends 23" Overall Length
Series 50 Delta Flow9325562 ½" in/out Offset In/Center Out 19" Overall Length
Series 50 Delta Flow9325512 ½" in/out Offset In/Center Out 23" Overall Length
Series 50 Delta Flow9325532 ½" in/out Offset Both Ends 23" Overall Length
NOTE: These mufflers apply strictly to Mustang. Three-inch pipe mufflers are not included because they are not recommended due to space concerns.

Complete Flowmaster Exhaust Systems
Complete Flowmaster exhaust systems are available from Virginia Classic Mustang for classic and late-model Mustangs. If you're doing a classic, there are four basic systems designed to fit: two for '65-'66 and two for '67-'70. All are from the transmission crossmember back. If you have a convertible, you're out of luck because these systems are designed for hardtops and fastbacks only. Late-model systems (not covered here) are from the catalytic converters back (known as "cat-back" or "after-cat") with the H-pipe, mufflers, tailpipes, and all attachment hardware.