how is the mod'd 1.9 compare to the stock 1.6 as far as power?? i heard the mod'd 1.9 were the best for the price. i wonder what kind of 1/4 mile times can you get with the 1.9 mod'd rockers with all the 3.4 pulley supporting mods with a very, very good tune mid 13's? i heeard you only get 20whp at the max with these rockers also.