04-01-2008, 12:48 PM
1. Are you using your factory tach, or an aftermarket unit? Your factory tach may not be working correctly.
2. Does it sound noticeably higher....even with my dual flowmasters, I can tell a big difference between 2500 and 3300 RPM
2. Does it sound noticeably higher....even with my dual flowmasters, I can tell a big difference between 2500 and 3300 RPM
1996 Bronco, 302, E4OD -- 1977 F100, 300, C4