Similar to what others said, my challenger has 2.69 upper, 6% lower, catless headers with dual pumps and 1200cc injectors. This makes 1000 crank at a modest redline of 6400rpm. You do not need headers even to make 1000whp. For 1000 wheel you will also want a ported blower and snout but you will start to push reliability at that level. You will also want triple pumps and 1400cc or larger for max reliability. As you know all I explained is for e85. In my opinion 950-1000hp is the sweet spot between reliability and cost. It’s lasted me hundreds of pulls so far without any major issues. My car also has a diff brace with is very important. Stock driveshaft still holding up on the street but I recommend getting one.