The Xtreme is nothing more then a nice looking body kit, some fancy wheels, and a lowered S-10/Blazer. The V6 is not any different from your standard S-10 V6. The fastest Chevy S-series truck would be the S-10 SS. But the fastest Sonoma/S-10 was GMC's Syclone.
Blazer V6
190 hp
250 lbs of torque
S-10 V6
180 hp
240 lbs of torque
S-10 SS V6 HO
(older style front end, mid-90s)
190hp
Don't know torque but probably around 250, 260.
4-Cylinder (weak ass, do not recommend unless you don't mind struggling to go up hill)
120 hp
140 lbs of torque