how much are these cda filters and do they really ad a few horses im asking because i had a corsa up my arse tonight untill about 70 either my driving is crap or they are nippy little cars so i wanna get some improvement out of my engine what would i be looking at for about 220bhp being realistic. ps im not loaded so not looking at turbo or charger not yet anyway i was thinking of filter exhaust and chip maby cams also is it normal only getting 65 out of second gear?