Im really up in the air on which mods to do. I know i want to be in the 11's for sure. JUst Dont want any issues !!!

You will not reach your goal with a K2 package, at least consistently. HHughes ran one 11.99 with K2, but that's the only sub 12 second pass I've seen on the net with K2. It seems like their tuning is solid, but their exhaust manifolds just fall very short of the competitions longtubes.

yeah thats what im seeing as well im wondering with a custom tune what would happen thou u know

I would say a combination of the manifiolds vs LTs. Also, the Kleemann setup retains your secondaries along with a new high-flow primary cat. IIRC, bhamg, who has the MBH headers and cats have said that with the cats, it makes about a 20 whp difference.

Doesn't MHP run a sub 12 on tune only?

Good call on the secondaries! I would believe that on 550hpish cars that 20whp could easily be lost with cats vs test pipes, absolutely. I checked dragtimes and you are also correct, MHP, lol how long have I been saying MPH? Doh!!! Has 2 tune & drag radial only C63s in the 11s, one of them had CF Airboxes/Filters, the other had stock filters. That's pretty crazy. I still think in order to do it consistently longtubes are an essential part of the equation, this time of year the air quality is no ones friend!

I suppose you can reduce the impact of the cats on K2 by replacing the secondaries with GT Pro's x-pipe. I am not so sure that I would like to drive a LT equipped vehicle w/o cats. I really like the sound of Bhamg's car with MHB headers and cats.

My Mhp stage 2 tune only ran 12.00 all day with 3 sub 12.00 in the same day

Tune and Lts run 11.6-11.7 all day and the carbon air intake I have in my opinion doesn't improve anything mthis and I switched it up and I don't think either one of us were impressed with it! Just my opinion good luck

Hot dam! That makes 3 tune and tire only C63s from MHP in the 11s then.

I've heard basically the same, it's really only good for throttle response, would you agree?

Have you heard it both ways, with and without cats? How much quieter is it with than without?

I honestly think it's good for the look when u open the hood I'd much rather have the cash back to be honest what is the intake $2,500 ha that's a good start on wheels, evosport 2 peice breaks, header cam deposit. You name it haha anyway if someone out there wants to try it out I'll fed ex it to u I think it's worthless?