I've been able to find plenty of performance parts for the SH, most of them are not different from the base model. The exhaust components differ some because of the clearence needed for the ATTS control units. I got over my bout of lazyness and looked up the difference in my service manual. The SH has an elongated cat (TWC) and shorter mid-pipe (B Pipe). With an SH header the midpipe from an exhaust designed for the base prelude will fit with minor modification. (cutting the midpipe - which is strait so it should not be a prob)