If I may ask why not supercharging, you will get the power a lot easier and have a lot more everywhere else as well.
If the reason is insurance then check the insurance with all other underbonnet mods, you may think you are getting cheaper insurance but it will be a lot more expensive if they walk away when you need them the most.
Have the JMM cars been proven on a dyno or 1/4? There was some doubts over their packages a while ago.
As martin has said, about the best mod for the I6 is putting an M5 behind it, you should have no insurance dramas and it will feel a lot better to drive.
"God wants you to lead us to victory...but we are French and have no word for that."
Get NOS mate ,whack a type R sticker on it but there only good for 10 kw a sticker , neons, cut springs, big subwoofer mate
thats just about all i can think off for the moment
200kws at the wheels i guess cam heads extractors would be a good start
dont go into a shop and say i want 200kws at the wheels dyno proven unless the shop has the mingeantor in it cause the dyno settings can be messed around with to get huge figures
I used to have an open mind but my brains kept falling out
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