chubba,you don't need a 3.5 downpipe to run low 11's.as far as the stock headers my car runs 10's on them but they do crack,its up to you if you want to continue to pull them off and repair cracks and correct warpage,if you have the coin ta headers are done right.to get to your goal on the 49 you will need traction,lightened the car as much as possible,and octane to run high boost and timing.you will need a good converter and trans to take the abuse as well.having the scantools and having alot of track time are also key elements to going fast,most guys get impatient and opt for bigger turbo's and other parts.one more thing,running below 11.49 requires safety equipment that are permanent changes to car so if you can settle for 11.50 its not only easier to do on a 49 but cost alot less.