I'm looking for an aftermarket exhaust for my 2008 GS. I would like one that would add a low rumble but not be too loud. I looked at HMF but was told that I would need an "HMF EFI" box to clean up the "lean" spots. Do all the aftermarket require these boxes or are there some that do not?
Thanks for any help you can give me on this.
Thanks for any help you can give me on this.