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May or may not apply, but on my vette, & a few others we dynoed (4 different cars) @ CARTEK, the KOOKS pulled 5-10 RWHP more @ top end, over TPIS, ARH & Stainless Works headers....
Throughout the power band all were similar until about 5,000 rpms, them the KOOKS took off...
Throughout the power band all were similar until about 5,000 rpms, them the KOOKS took off...