Dual exhaust will give you the enhancement of having either an x or h pipe for additional scavenging. Keeping the pipe size down will keep velocity high and prevent you from losing low end torque, but a second pipe will give you additional headroom for additional power if it's added down the road.
97 Laser Red Thunderbird LX161k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant 98 Black Mark VIII 155k, stock daily driver 07 Redfire Fusion V6 SEL 178k, for the wife Gone but not forgotten: 96 Mark VIII, 94 Cougar XR7, 93 Mark VIII
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Im now on my 4th exhaust setup and think its finally done except headers. First I ran no cats or res with dynomax mufflers. Then bigger pipe stock routing with super 44s. And coming in 3rd place is was true dual 2.25 header in to 2.5 mid with an h. Im now running 2.5 and an x. I vote 2.5" with an x pipe and some super 44s. Loud and proud sounds sexy too.
I have afew clips at the top of the exhaust section. I should put up another
The Texas Green Bird (An undeveloped work of art.)
92 Thunderbird Sport 5.0: Sold
ok update got the exhaust up, welder had to add two lengths of slip on piping to the sections that face the engine to mate up to the ones previously done from the exhaust manifolds. and heres the exhaust system from the exhaust manifolds back with no cats or resontors, i have to admit though that the super 44s are a tad louder than i thought and tone is different from what a fox may sound like with same mufflers. mayabe due to the fact motor is bone stock @ 200hp and the location of mufflers being that on fox bodies hve their mufflers mid body mounted and tone may change when exhaust runs through a tail pipe out of muffler.
You're AOD is going to shift really early if you go (numerically) any higher than 3.55's..
One way around that is using a Full Manual Valve Body that allows you to control the shifts..
Do you think you could post some pics of your Down Tubes & The middle section of exhaust on your Thunderbird?..Thanks
Rayo i didnt manage to get pics of the bend tubing made after the exhaust manifolds to the mandrel exhaust system but as soon as i start messing around down there again i will take detailed pics front to back. what i can tell you is that when i did remove the stock 2 cat pipe my muffler giuy exacted the same 2.25" pipe with as little crimping as possible. real clean exhaust piping from both manifolds back.