The guy who did my Upsolute chip said the next step to higher performance would be a cold air intake and less restrictive cat/exhaust. When I get a chance, I'm gonna go back to see him when he's got time to do some digging under the hood and get it up on a rack to see what he proposes. He offered to do mods for ~1/2 what he would normally charge if I'm the first for him to do "prototype" on. I'm just leary about doing mods like that, they'd be immediately obvious when in for dealer service and could jeopardize warranty?