I have the non resonated with stainless mufflers and non res 200 cell hfc's. Everyone says its very very loud, I want it louder though. I do have some rasp around 4k rpm but the sound is incredibly deep below 3k rpm and very exotic above 4k. Crusing 80 in 6th @ 3k rpm there is drone there. It's not annoying though with the windows down, but when they are up it's very annoying. Whichever FI system you choose, you will be happy. These things are amazing and great quality. If you don't want it very loud or drone, go with a resonator and keep stock cats.
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Precision Turbo Tial Turbosmart Fast Intentions Seibon Prosport Advan AD08R HKS Hipermax IV Nismo Evo-R PW:JDM UpRev Pioneer Escort Volk CE28N
Top Mount Single Turbo 551whp/482wtq@10psi
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