0Terry@BMS

Looks like you bumped a pretty old thread here. But IMHO 18% lower is going to be too much without tuning even at elevation, especially considering you're probably also on 91 octane fuel, and if you already have an intake or our drop the effects those have on leaning out the MAF reading vs stock. Maybe could swing a 9% but any pulley change is going to effect the warranty the same as a tune would so might as well do both.

6Speeder

Yes, I am. I checked it with a wideband, on the street and on the dyno. My A/F is safe, and my KR hasn't changed, still minimal. No tune.

EMINENT 1

Interesting.
Do you remember the A/F and what you dynoed vs base? But, doesn't matter as it still voids warranty, per Terry?

6Speeder

In the 12's till COT kicks in, then is in the 11's.