Now that all the crybabys have seem to shut the *** up!! No one seems to compare apples to apples. Sean sells a S/C kit..... point blank. Most everyone else out there sells a S/C, intercooler, headwork , cam, pistons , crank, fuel system, and I am sure I have left some things out. So how can anyone, knock the Roe system for not making enough power. Lets take someones S/C system without all the extra mechanical add ons and intercoolers and see what kind of power is to be made. OH we did 557 hp I forgot about that post. Now I know for these other ENGINE BUILDERS that it is not the idea to just bolt on a S/C and go. Now with a couple of the Vipers that have Sean's system on them and have had engine work done to them they are making over 700 and I believe over 750 rwhp. Not to shaby. And I think in time you may seem someone do some major engine work......( you know the kind that other Engine Builders do) and add the Roe S/C. So now maybe some HARD HEADED CRYBABYS will see the light. The reason for such a cost diferrence is your not just paying for a S/C, your paying for enging work and 6 to 12 months of Storage for you car.