Running Meth on my Maggie and have been pleased with it. Didn't set it up to add alot of HP more to lower IAT's and it did, help with fuel if I got any bad gas and didn't know it and then it never hurts to have a little added fuel up top. This did allow me to safely if there is such a thing up the boost a little which did give me MO RWHP. And on a side note I pulled the heads @ 20,000 miles to do a LS3 conversion Cam install and the pistons were very clean and that can't hurt either. I think its all in the setup and your end goal in mind. Meth can be your friend.