Discussion
ACR-X headers make 10 bhp more on power dyno at peak, this is fact from talking with the test engineers (SRT)! If you are going to run your car at WOT on the street (!) like you can on a race track, you would want them. They also make more heat as they are stainless. Beautiful header and make the most power when it comes down to it if you can feel 10 bhp more; but, Belangers are so easy to fit and run cooler, so would be my choice for a road car with mild mods. 1 3/4 is the same as port size D-shape of your heads.
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