Well I'm going to try a 200/320 primary spring to raise engagement some, see if the helps out on ininal stab stumble some..
Redline has figured out a way by adding in some resistors to air temp sensor to drop fuel out of stock tune off the start.. What we are getting is a over fuel down low, that is where the stumble comes from listening to Dave.. He says he has done that on his kits and others to get rid off it, but we now need to run more fuel in tune to make up for it after being so dam lean already..
Can't get Paul on board to add some yet for me..Dave is also removing the oil pump on his kits and dead heading the Garett turbo oil line, like Boondocker and Sibler have done as well.. This cleans up the kit pretty good and for me would of saved the turbo when the fuse to pump went out.. They now take oil off the rave line
As for the redline 850 kit, I have heard lots of good, but it better be running real strong because this 800 Impuse kit is no slug.. I will garentee that.. Dave has see mine running.. Would love to compare, mine rarely get off 10 lbs when need be and might hit 12 for the occasional poke