We just finished testing our first 3 engine performance packages for the SRT 10 models. Our stage 1 and 2 systems were designed to be truely smog legal. They will pass an IM 240 smog inpection in all states (the visual, emissions and dynamometer test). These systems had to work with the stock exhaust manifolds which are very restrictive. With the positioning of the dual catayst so close to the stock manifold, there is no way a smog legal header can work. changing the cats or relocating them is prohibited on new vehicles unless it is certified. Our stage 3 system uses a true header with a single cat but is advertised as a "off road sytem only". The results have been good and the hp numbers real (subsequent testing of our systems on other dynos have shown much higher numbers.) There are no real smog legal headers for the SRT. Systems may pass an emissions test out the tailpipe but are not certified (This can be a big problem when you sell a car or have to go to a referee smog station). Here are the results, Stock 434rwhp 465rwtrq Stage 1 476rwhp 498rwtrq Street port heads Non bleed down lifters Chromoly pushrods K&N Filters Borla Mufflers Stage 2 497rwhp 525rwtrq Extruded intake CNC heads True roller rockers Chromoly pushrods Non bleed down lifters K&N filters Borla mufflers A/F tuning Stage 3 530rwhp 541rwtrq Same as stage two plus Headers Comp Coupe camshaft Our biggest hurdle now to get more hp is in the intake manifold, with longer runners another 40hp can be gained. Pricing and dyno sheets will be on our web page soon at www.dcperformanceinc.com soon.