3" exhaust
3" would be ideal, however i don't think you would like the system to dump right after the rear end as the road noise is unbelievable. Not cool road noise like the lowd roar of a blue oval motor, more like a horible and disturbing viration. In my opinion you woudn't like it especially after aying through the nose for the comple system. You do have good intentions though, cause at one point i thought that was what I wanted. NO. Stay with 3" off the header (as you will soon have the 3" headers) and have the x pipe installed along with a comple over the diff and OUT THE BACK OF THE CAR style system. Keep the 2 chamber flowmasters as they sound like none other. OOOHHHHHH gotta luv that chambered sound. As for your y-pipe idea I don't think i quite understand. Anyways it's only 6 bolts to unhook the complete system from the headers. I've see a product advertised in MUSTANG MONTHY lately that was amanual buterfly style piece of cast iron that when directly after the header. The butterflies when activated by pulling on the cable form inside of the car would set all of you emissions free. This is a lot of work when you include all the cable mounting etc. But if yo're interested I can look for the information on this. From by point of view as a student as well it wouldn't be worth the money. By simply unbolting the 3" exhaust you would obtain the greatest overall flow. The butterfly/choke system might hurt flow.
Additionally the cowl ram air idea sound great but save yourself the trouble and get a nice fiberglass hood. By carrying out the idea the firewall would need to be modified and that is a key structural pointin the unibody mustang which applies to all years except the new 2002 mustang. An idea to ponder: find an aircleaner and put weather spripping around the top of it as your ram air seal between the aircleaner and the new hood.
Just curious have you done anything substantial to the motor yet? For example a cam change or head porting .....
Hope that helped,
Trevor.
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