If the system is set up correctly and you are using the correct parts you should not need one. I have a Billet Pump, with twin toilets, older barrel valve, no high speed. I bracket race 8.30s @ 2800lb 572 B1MC deal also Throttle stop race S/G 9.90 deal if you must use one use an electric one ( more consistant) I would talk with Scott Offerman at Killer Rons.com he can help you out. Your barrel valve should be set at around 17-28% leak down unless you are blown or boosted. This is system is deadly consistant dont over complicate it