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I run 91 just to get the best response/hp by keeping as much timing as I can. It was a bit noticable off idle but do you feel/know you got more hp, no. I use it as another mod to compliment the headers, exhaust and airaid and these are all I am doing so all help together as a package.It also helps keep power up I would think if any mod makes car run a bit leaner the engine may pull timing so this would negate that but again not real noticable on the street.Scrming had a video of timing being pulled on 87 just cruising around, anywhere from 3-8 degrees I think.On 91-93 no timing pulled or darn little.Could be worth 6-15 hp if 1 degree= 2 hp as it did on my LS1 V8
Nice thing is we can switch back to 87 anytime.
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