it would sound the same, very untellable to the ear
NOTE: 2.5" zorst is to big for a NA vl 6 and to small for a turbo vl
where a 2.25" is the right size for the na vl 6
and as for cannon zorst what do you mean?
i have extractrs, 2.25" cat back (straght thought with no rear muffler) and it pursssssss, nice tone to it and not overly 2 loud, (i cant really tell thought, as ive neva herd my car drive by me)
just remba i got a vid of it, and it dose sound nice
if u wanna know what it sounds like just add me 2 yah msn
well, for more power depends how far your wallett opens, if not wide enuf, then cat back zorst(2.25), Cold Air Intake if your willing to do it, good service of the car, advanceing of time to 22degrees BUT must runn it on Premium Unleaded Petrol (PULP) to stop pinging
if your wallett is opening more then that then you can get extras like extractors, highflow cat, K&N panel filter(recomended for the CAI), new bigger high tension leads (8mm or 9mm but not sure bout 9's) and if yop got the money then you could get a factory turbo set up for about 2 grand
JUST REMBER IF U WANT TO GO FAST YOU GOT TO STOP FASTER, SO UPGRADE THE BRAKES AND SUSPENSION.....
If you run the stock CAT and both resonator and muffler it will not lose too much back pressure. I have a 2&1/2 catback with pacemakers up front and its great when you get up it. Sounds great too. Change your airfilter too, will help it breath in and out better also take the snorkel off the airbox and make the sqaure hole the length of the box. Dunno about with the cannon tho they are a high flow muffler so 2&1/2 might be losing back pressure with it on.