Quote:
Originally Posted by 4.6 Punisher
I only did my exhaust for sound. If I go back and redo it, it will be true duals with an x pipe, long tube headers, and dual Magnaflows.
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That's what you want.
Data from the past - The difference between Shorts and Long Tubes on a 5.4L is 30 hp and 35 foot lbs of torque @ the rear wheels..
Your 4six will show at least that from what you have presently if you go with High Flows and Magnaflow mufflers. A 2.5" SIDO might be better. - And/Or an X muffler..
True duels and x pipe - I would knock the pipe diameter down to 2.25 in order to keep your torque down low. But, with Magnaflow mufflers you could probably run 2.5" and custom tune and still be in the ballpark to were a tuner can give you what you want. You have 2.5 now, so I would just go with it. You get 3 tunes so you can work it in.
You don't want to wait to long on custom tunes after an LT install. It's a long wait to get them back sometimes. You could be running lean and that's not good for an extended amount of time. That usually is a 3 valve issue, but I would sk about your 2 valve in the other forum.. You SHOULD be in the process of getting your tune tweaked after the LT install IMO.
Best thing to do is visit the chips and tuner forum and ask PHP some questions about that. They visit the forum often - It's far better to call them tho.
That's about all I can help you with, hopefully others will chime in with their suggestions.