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i jus got headers and i hooked it up... i ws too stupid and left the wire connecting the catylac convertor senosor by the down pipe and the wire melted. It was good until then.. my speedo jumped now it doesnt work and it jus goes allver the place... wen i first start my car and rev the check englng dims slightly and my speedo meter jumps allovre and somestimes works like a tach.. i got a new o2 sensor and rewired everyting but still same problem... so if anyone knows wats the problem let me know asap... the car drives perfects still but jus lags ailttle....