The srx will top end the rx1.I had an 02 srx 700 with 300 miles on it last year which was totally stock,i raced my friends 04 rx1 also totally stock.Niether sled had studs.We ran them down a lake 2-3 times for about a half mile.Race # 1-We both hammered the gas and the rx1 took about a 4 sled length lead out of the hole as my srx sat there and spun the track,the rip saw track hooks up way better from a dead stop.At the end of the run i caught and barley passed the rx1 in the half mile.Race #2-I learned from the first race and didnt hammer the gas wide open,i eased into the gas to control my track spin and ran even with the rx1 out of the hole,by mid track i started pulling away,by the end of the 1/2 mile i was about 5-6 sled lengths in front of the rx1.I weigh 195 on the srx,he weighed 180 on the rx1.Race #3 had the same results as race # 2.