Rev limit on a module-based ignition control is fixed by whichever module is plugged in, so a single module leaves no room to adjust. This kit supplies five of them spanning the 4,000 rpm range, which covers break-in limits, towing limits and lower shift points for a mild street engine without buying modules one at a time.

MSD 8744 4000 Series RPM Module Kit Features:

• Five modules covering 4,000, 4,200, 4,400, 4,600 and 4,800 rpm.
• Even 200 rpm increments across the kit.
• Plugs into ignition controls that accept rpm limiter modules.
• C.A.R.B. E.O. number D-40-29.