While you can open the exhaust system up with a CAT back system and freer flowing mufflers, the bottle neck is the header setup where the front bank flows under the engine joining with the rear bank, true dual exhaust can not be easily accomplished.
So exhaust flow is hampered. If Sunoco still puts out 93 octane, use it.
In case you are connected for Mercedes used auto parts or transmission, you are right here to find a wide white of used Mercedes parts at low prices. Even you will find used appliances for cars, trucks and salvaged cars, trucks for sale here.
I would keep my tire pressure at the high end of the range to promote better rolling resistance.
Consider using Evans coolant, it boils at a higher temperature and reportedly moves heat out of the engine more efficiently.
Our own XA-XB Falcon GT Market Review stipulates that sedans will reportedly represents one of just 89 GTs finished in "Tropic Gold".