i can confirm the fr500 cat back exhaust mates up well. the runble is good, you can actually here the exhaust. also my tech removed the air silencer and reprogrammed the fmu to tell the computer i use 93 octane. i can also confirm the steeda shifter works well with precise shifts. i now need a new h pipe or high flow cats to complete the exhaust. thought you guys may want to know. the 03 mineral gray is a screamer. also the steed does have some road noise. i hope some insulation will cure this. good luck.