Been trying to decide whether it's even worth the hassle/expense of converting my '84 CFI Fox to duals, so I'm considering alternatives. This is my DD, not my weekend toy, so I don't plan to do any major mods to it in the future like heads or anything else, and I plan to keep it CFI for the sake of fuel economy and general drivability. I'd just like to uncork the exhaust a bit to hopefully give the thing a little more pep (maybe even improve the fuel economy just a tad, if it allows it to run more efficiently) and to give the thing some better sound - right now, it sounds exactly like a friggin' stock late-80's Crown Vic.
1. Is there any performance difference between duals and a 3" single exhaust?
2. Aside from a couple of minor upgrades (electric fan with 3G upgrade, drop-in K&N filter, bumped timing), on an otherwise stock CFI motor, would I even NEED to go with a 3" exhaust, or would a single 2.5" exhaust be sufficient?
3. If I do go with a 3" exhaust, would I need to have an entirely new exhaust made from the header flanges back, or could I use the existing downpipes (I'm assuming they're 2.5" on both sides?) and have a muffler shop merge them into a new 3" single pipe?
4. Anyone got any pics of their single exhaust setups on Foxes?
Mucho thanks in advance.
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