cold fusion is a really good wet kit that is worth up to 200 rwhp...runs about $500 to your door through nitrous direct...i hear they use the same solenoids as TNT...ive had both and in my opinion....look the same in quality

 

Buy the Cold fusion upgrade for ls1, its $199 dollars, and a nos cheater fuel solenoid $30, a switch and button, you can find in almost any O'reily's and your there.