12 valve hp
#13
#15
#17
its worth it to grind out the air intake elbow that goes to the heater grid, match it to the manifold. and u can flatten the step in heater grid side down a little bit. its like a 90 degree step down, i did this and free'd up some restriction. might not be enough to notice but your mileage go up like 1-2 mpg. mine got about 17 untill i cut out my cat and muffler then i went to 23mpg. if i was running diesel i would put a new cat on. mine was just plugged up about 60%
#18
its worth it to grind out the air intake elbow that goes to the heater grid, match it to the manifold. and u can flatten the step in heater grid side down a little bit. its like a 90 degree step down, i did this and free'd up some restriction. might not be enough to notice but your mileage go up like 1-2 mpg. mine got about 17 untill i cut out my cat and muffler then i went to 23mpg. if i was running diesel i would put a new cat on. mine was just plugged up about 60%
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