ive been told that the 85-88 7s have their 5th and 6th ports open off of backpressure in the exaust. i found out that 89-92 open off of a water pump or something like that but i cant find the website that i found this info on. i put straits on my 7 but now i have no backpressure and the ports dont open (im assuming) does anyone know how to fix this.

get rid of the straights

why