Hey i need a little bit of help here, what should i shift from 1st to second in a 91 Civic Hatchback Si with a 88 CRX si motor, aem cai, fuel pressure reg., chikara header, thermal exaust, bosch spark plugs, cuz it seems like whenever i shift 6000 rpm or redlin 6500 from 1st gear it will grind hard and it sounds so bad when it does... but i looked up my peak hp is at 6000 rpm but would that change since i have mods??? and my peak tq is at 5000 rpm so i'm thinking about shifting at 5500 in 1st gear, is that good or would i be loosing a lot of power that way? Please Help!!!! thank you for all who respond