i'm thinking about throwing some headers in my 95 k1500 but i'm not sure what route to go. since right now my exhuast is 3" to my glassback then it splits 2 1/4" duals. i eventually wanna run true duals but not really atm. my exhaust manifold is warped atm and it anoys the hell out of me. i was thinking http://www.summitracing.com/parts/B...|1995|Make|GMC|Model|K1500+PICKUP&prefilter=1 but will those line up with stock y-pipe or should i go with and after markets? also if i do so go with the after market y pipe my o2 sensor is wired right in the front of the cat on the stock one. 3 wire after market instead of the stock 1 wire on the manifold. what should i do?