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Originally Posted by IceMan
I have a black '04 sixer and a 3 1/2 inch borla dual setup with flowmaster 40's. The rumble really changed the whole feel of the car... Before you heard the engine... now it's drowned out by throaty roar of my exhaust heh... and I don't even have a midpipe... just stock cats. Wait till I throw in a prochamber...
Your best bet is to goto a custom exhaust place and just have them build a right side to your exhaust, the sixers come off the headers and merge into a y-setup and go straight back the left side through the crap muffler ford threw in. just have them build you a right side, throw on 2 flowmasters (or straight pipes, but they don't sound very good on a sixer IMO) and get some nice big stainless (not crappy chrome plated) tips. should run you $300, parts and labor.
You could always buy a complete kit (midpipe and catback) but that'll run you more than a sixer is worth putting into unless you have the money to burn...
::edit:: as to the new bumper... just have them run them below your stock bumper, they look great there... I'll take some pics of mine and throw them up here one of these days.::edit::
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Seriously..if you have 3.5 in you are killing your back pressure!!!
As far as if its worth it? What are you looking for? Better gas mileage? Better Performance? It may help a little bit...but you are not going to gain that much from these two things...maybe 5-8 hp MAX on a Sixer....and the sound is not that good....Better than stock, but no where near a V8 with the same set-up!