yes it would make a differnce in power but it would cost $$$ as there isnt much room to work. if you get extractors get the rest of the exaust done as well
ive already put a lukey exhaust on from the cat back but i need something more, and i cant afford a turbo doh! i might go talk to my local exhaust place
extractors will not give u much of an increase but a little... for the money i say not worth it as i have been there and done this with my 4age i use to own.... i could not feel any noticable increases.... was also a good brand "genie"... lots of money little go!