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I have a twin turbo set up (Innovate lm-1 & accel dfi) and I see about 700 degrees at light throttle cruise with afr at 15.1 and timing at 45-49 degrees. This much timing only works with light engine load(high vacuum),but it does help keep the exhaust temps lower from what I have seen.I don't advise that much timing advance, but it works for me. WOT- afr 11.7 and about 1000 degrees ex. temp at 15 psi boost.I have noticed that single turbo engines have higher exhaust temps than twin turbo set ups with the same hp output.I hope this helps.