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Just completed the install of an entire Kook's exhaust system - from the long tube headers, Boss 302 specific H-pipe, and mufflers. Took this LS and an identical LS with a stock exhaust system and put them both on the dyno back to back. Here are the results from the Kook's. Very, very impressive that there is a very consistent gain across the ENTIRE rpm range. A very worthwhile modification in our opinion.
I'd post the graph if an admin tells/allows me to.
I'd post the graph if an admin tells/allows me to.