to advance or not to advance cam???

I had to go find a pictuer of that intake...lol. It looks to me like it has shorter and larger diameter runners than the M1. I think it's a few small things making it launch soft. I's try the M1 with that 750 if you have access to it as I've had good results with them and honestly if you're not turning much over 6K that 950 is huge for your package. The difference between a 4150 750 and an HP950 is over 300cfm because one's dry flowed and the other is wet flowed. The dry flow loses about 15% when compared to the wet flowed. The 950 dry flowed would be closer to 1090cfm... they are that much bigger.