The best is the
iris / disk type that sits under the carb. REAL pricey but they are the most accurate I'm hearing. If you don't want to spend a couple of grand on a T-stop and controller, the Dedenbear Co2 linkage type is probably what you want. Most popular anyways.
A pair of modified TS-10 is what Regan uses on his tunnelram, and I'm going to give a
TS-30 a try on my tunnelram You can get either of TS- in kit form with a Co2 bottle, regulator and lines, or solenoid only. I'd stay away,, VERY FAR away from the electric solenoid stops. I've ran solenoid shifters and they all seem rather 'clunky'. I cant imagine the throttle stops would be any different. Besides, with Co2 you have adjustment for how fast the ram moves from part throttle to full throttle. A solenoid simply SLAMS one way (a TS30 is pressurie controled both directions).
Controller is going to get in your pocket too. You can go with a simple
two stage controller or jump feet first into a
command center that offers just about any racing electronics you can imagine. If you ever go to transbrake delay, air / automated shiftes by time or rpm, line lock burnout timer, 2 or 4stage throttle stop controllers, RPM / timer switches for N2o activtion,, the Command centers have just buttloads of 'goodies' to play with.
Be careful about what some events will consider 'electronics' and what is not.
Usually if you run a single wire to the transbrake and don't use the transbrake delay, your not electronics. But every track and sanctioning body has their own rules.
electronics. But I've also seen rules that says ANYTHING that is other than a direct, mechanical throttle operation is 'electronics class'.