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As long as you do not try to turn up the boost past .8-.9 you will have no problems. Think of it this way, the original turbo was less efficient than the K27 at higher flow rates, consequently the charge air temp is probably lower than it was stock. The dual outlet muffler hopefully has less back pressure than the stocker and will simply allow more air flow and quicker response (at same psi will not change air temps a whole lot, depending on efficiency curve of K27 turbo). Same goes for SC cams, they will simply allow better cylinder filing and a bit better response, while at the same time reducing dynamic compression ratio. Overall you are not making massive sweeping changes to your engine compared to stock. As long as your A/F ratios are safe, you will be fine. If you decided on adding a better intercooler to this engine, the greatest difference realised is not in keeping the stock boost pressure, but in the fact that you can turn the boost up more.
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