Don't boost an LS motor unless you plan to go ahead and do forged rods/pistons. The LS rods are inherently weaker than a VTEC motor. They don't see the RPM's as a Vtec motor, therefore they are not as strong. Now if you are talking about 8psi max then yeah, you can do that. As far as making 250 whp from an NA lsvtec, ask Vteckidd how easy that is. He has about 8k+ in his motor and he made 237 at the wheels on his motor. Here's a nifty idea. Get a K24 from a TSX. To do the TSX swap is still pretty expensive, around $5K. You'll have as much Hp as a built B series with much more torque and when you get ready to boost it you'll have a tremendously better platform to start with. Then you can make serious power. Again it all depends on your budget. There is a sticky in the all motor forum about LS/Vtec and pretty much all that you need to knokw to get started. Good luck.