[QUOTE=...So, by swapping out the headers and the muffler, I gained almost 15 HP and 18 pounds of torque. The "butt dyno" feels it a little, but the ears hear the rumble far more.
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I'm muchos impressed by your results. Am really glad things turned out well, in fact, much better than I've hoped for. I did something similar to yours with my Dansk headers, sports cats and muffler but I didn't believe my results were as good as yours. 15bhp with improvements across the rpm range for a set of headers and muffler on a NA car is nothing to laugh at!
Let the skeptics be silent on this one
