My car has been getting some unwanted attention from local cops. I want to know how I could keep the noise down. I have the RPS turbo kit. Would changing the exhaust manifold/ headers to HKS or SP unit help? I heard the HKS and SP a lot more quiet than the RPS. I also have a loud and rough idle from using 272 cams. It sounds awesome but shakes the cars around it. Would steppin down to the 264s provide some noticeable improvement? FOr exhaust I have the PE but thinking of either going back to the stock with a custom 3in piping or the greddy SP. Anything I could do to the downpipe like wrap some sound deafenin stuff over it. Tips anyone?