save your money unless you consistently redline it,however the aggressive tone will annoy others and make it feel noticeably faster,now if you have to replace your stock system:why not?None of these things"extract" as far as I know,the only real gain would be less pumping loss unless of course...
I used to persue efree gas religiously,after working through that pita scenario it made so little differnce as to be not worth the trouble( don't even use it in my small engines-the trick on small engines is run the engine completly dry before storage so the crappy rubber parts will not swell...
it will surely disappoint with decreased engine life and worse fuel economy,if you want more "g's" at lift off. get a mustang or an EV!( btw "Dealers" install nothing,it might be a jealous kid who hates his job.
until the manufacturers figure out to make them"hanger Queens" and unreliable,I am of the thought early adopters may get better vehicles,the "die is cast" on some of this ridiculous safety equipment that is required these days,a funny fact the small economy cars got bad press,according to my...