i am looking at headers and my engine is basically stock save for the mods below. would long tubes hurt the performance and not be worth the extra money?(There will be nitrous in the future)I am looking at either MAC longtubes(since it is about the only cheap long tube for my car) and a list of shorties that include FMS and MAC.How much is actuallt gained from the shorties/and o/r pipe? Also what would sound better with borla mufflers, an o/r x or h? Is anyone using just the mufflers or a similar setup. let me know.