The stock is 80mm but has the post down the center of it. It was the last thing I did on my car and it picked up about 5RWHP based on my track times. Is it worth it...yes if you've already done the other basic bolt-ons like gears, Offroad H/X, Pullies, Timing Adjuster, etc...
Bill
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00 GT, MAC Offroad H, Steeda Pulleys & Timing Adjuster, 4.10’s, Flows w/turndowns, UPR shifter, UPR Pro Series LCA’s, Lakewood 70/30’s & 50/50’s, 253.8 RWHP/292.8RWTQ
12.91@101.93 (1.74 60ft)
M/M 100, 7085
2001 Mod Motor Shootout 2V NA Champion
Recent Pic from Moroso