I'm looking for the best system as far as weight savings and overall performance that can still be gotten today. I have stock headers and D&D slip on, but isn't the performance version slip on. I should be getting my engine back in a day or 2 from shop that is doing degrees on stock cam using APE adjustable cam sprockets. I already have woolich race tools complete system (quick shift, data logger, and full ECU flash hardware). I have my core moto apex 6 wheels on hand. Rear sets, tires, brake rotors, and exhaust is all I have left. Slow build turns into get done ad fast as possible from unexpected emergency on second vehicle. I have completely gutted intake, and have racing air fillets on, and have done pair block of plates. I need exhaust to work with what has been done to bike to far, not one just because.