I only care about performance really. Although $34 may sway me to SU if it is a better made product. I am more curious about the actual core difference between the two. Seems odd that the SU is 3.18". Usually intercooler cores are at least rounded to the nearest 1/4". Both appear to be bar and plate. Is there any noticable difference in the cores as far as number of boosted tubes, Fin spacing, or end tanks?