Power wise, the numbers arent too far off for the 2.5 compared to the 1.8t. It will be abit less then your use to but still quite a fun engine. If you ever want more power out of it, theres plenty of aftermarket parts to keep you happy for you. As for the 1/4 mile, I think I read on here someone did a 15.2 on a relatively stock motor. Might not be as quick as the 1.8t outta the box but what your gaining in reliabilty should more then make up for the difference. You wont be disappointed with the 2.5.