might have just been my ears mate, they are ruined after years working in an industry of loud noises
the pro drive back boxes were good, having re read my post i have decided i said the wrong thing, there was nothing wrong with them and they did sound good, alot better than the standard back boxes.
it is worth saying however that alfatunes exhaust is better, dont not chooe it because you think it might be too loud, once it worn in its only a tad louder than the prodrive back boxes but it has a nicer sound to it, just my opinion
i found that just putting the prodrive back boxes on did get rid of the jerkiness and the hesitation but i also felt like i had lost alot of low down power, the car was noticably slower off the lights.
what you need is a re map from a proven reputable company like alfatune, once i had the re map done the prodrive back boxes/ alfatune re map was a fantastic combination. the alfatune exhaust just compliments the re map even more and does deliver even more power than befor when past about 3500 revs. it also sounds fantastic.
your best bet is to get the re map done, not just the back boxes changed, the re map is were you will notice the biggest improvment
not had a chance to get the car on a rolling road, it goes alot better now thats all i know