first of all the Elantra has a 3hp extra drop in hp due to extra resonator and I'm auto, dynoed @ 113 whp , a 5speed tib dynoed @ 119whp with btb, kore intake and ported manifold. giving the auto has 8% more power loss and the 3 hp resonator loss ( Still stock exhaust ) and my headders do nothing till 3500 rpm and reverse math the motor is making 160 bhp and 152 ft lbs. confirmed with a 16.7 N/A on the track letting the tranny shift it self. Brullen will be making a cat and back exhaust for Elantras with headders that will laso fit tibs ( hint ) it will be a quiet sniper system too no loud farty mufflers here