Not sure if the Megan racing piece is like most others (or like it's own headers w/ the super thick flange), but be careful that you get atleast one thread (2 recommended) of the upper strut mount stud above the nut. Most of the front strut bars on the market did not correctly take into account that the tC has upper mounts with stiffening ridges. This does not allow the strut bar flanges to sit flush on the the strut mounts as in other cars. This is the case of my Greddy Strut bar. Greddy provided some aluminum spacers that would have not even let the nut grab a thread. My Hotchkis (TRD) fit just fine.
Note: You will need to get a set of adjustable rear camber links as anything lower than the TRD springs (100% of everyone else) goes beyond the factory camber adjustments. You can get the front adjustment bolts for about $27 although it is beneficial for that 1° negative camber that the OEM tires/wheels and the Hotchkis TVS 1 springs provide. 40K miles with even wear on my stock Craptenzas.