for the sharp-eyed, the one giveaway on mine is the boost gauge on the driver's pillar -- no changes to the body except for the relatively unobtrusive http://www.motorcitymold.com/stock.html extractor hood (lets the air from just behind the radiator out from under the hood; said to be good for .2 in the quarter, engine runs c. 20 degrees cooler even/especially in hard use, pretty much eliminates the front-end lift that in a stock-bodied C5 can become a bit distracting above 175)
and really, subject only to whether or not and if yes to what level a twin-turbo setup can be installed in any given GM vehicle that'll take a small-block, LPE can stuff whatever anyone could want in there -- gotta be just a matter of time until some smartazz has them stuff a 2000-hp tall-deck LSX ( http://www.gmhightechperformance.com/tech/0702gm_lsx_engine_block/index.html ) twin turbo into a ZR-1, lol