Re: Exhaust

4 to 1 is most likely cheaper because there is only one can intead of two so less cost in materials. As far as performance difference I doubt there would be much gain between two different set-ups of the same brand. Get what you like the look of best. Did you search ebay for orginals? As far as brands any major brand is pretty safe. I would stay clear of no-name or any brand name you can't find much info on.