3L SVT will own the RSX that you have described. after i wrecked my 1st 'tour, i bought an SVT and proceded to swap a 3L in. 3L, intake, heatshield, and a dual exhaust was all i needed to silence one of my coworkers with an RSX with ease.
Green '99 Contour SE Sport ATX -- wrecked
Silver '00 CSVT 3L hybrid
Silver '95 Thunderbird "3.8 V6" -- swapped 5.0 from wrecked mustang FREEBIE!!!