First off, this si in the exterior not the performance because it is about the look of the tip size. If this is the wrong place mods please move it. Thank you

I now have my compltet exhasut system sitting in my room waiting for spring to be installed. SO im looking for tips now. I want a magnaflow double wall tip. The one I like is 2.25 in, 4" out.

will 4" look odd on a stock 05 bumper? or should I go with 3" - 3.5"??? I do plan on putting the rksport lip kit on thought. Whats your thoughts?

That tip looks good . I like it .. i would say go for it . 4 inch wouldnt look bad if you had the lip . The 3 inch may look a little cleaner without a lip.

I have the Magnaflow Single tip catback system and it has that exact same tip on it and it looks fine, it will look better with a lip kit but for a stock bumper i'd say 3"-4". Obviously you dont want to go any bigger than 4" cuz then it will just be stupid. lol.