You can have the most perfect tune in the word but if you have to much compression and not enough squish it is still going to detonate, with that said, yes you will lose some bottom end and some hp by raising cylinders but it will clearly be made up in boost pressure.
Please listen to Inkedrider, and lower your compression. And then you will see why you shouldn't. I run a stock head in my Tm7 and I have ran a solid 500 miles @ 18 PSI. I have ran a good 50 miles at 20 PSI. I have burned the engine down, but not from the stock head. At 20 PSI, it blew the head off, and two bolts shot out. It leaked coolant in the engine and wiped it out. Then, the stator was going out, and starved the engine of fuel under boost. Took the engine out 4 times before I figured it out. It would build enough fp at 12 PSI so I ran it there and it progressivly got worse. 10 PSI and then again at 8 PSI. I am still fighting the new stator.
Any way, it doesn't matter whose kit you have, whether its BD, or a twisted, you don't need to take squish out for 8 PSI. BTW, I saw a twisted kit, and they run pretty good. I know that BD has a different set up with the EBC such, but that intercooler that Shain has is pretty trick. I would recommend either.
All I know, is that I going to upgrade to a pro from the vintage M7. Please keep posting feedback on both kits so I can make a determination of what to go with. Again, I know of about 8 BD kits on Pros here in Idaho Falls, and they rip.